I charged it properly yesterday to 35 psi on the low side, and the high side was around 260 psi. When the compressor shuts off or you turn your car off the pressures in the system will equalize between the high and low side so the low side pressure will read much higher. Obviously the main issue that people deal with when they have a broken A/C system is that the air coming out the vents is not cold enough. Read also related articles: Can you mix synthetic oil with regular oil, solar power need for RV, whining noise when accelerating, oil in coolant, and best antifreeze. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Discussion in 'Trucks [ Eighteen Wheelers ]' started by cainekh, Aug 3, 2013. PSI is the common measurement for pressure used in terms of pounds per square inch. Low side is low. Use the pressure reading when the compressor is cycled on and the system is operating at its highest settings (temp to … AC help on tripac. Air conditioner systems use refrigerant in order transfer heat back and forth between the evaporator and compressor. REGULATOR 530 AC PRESSURE 0-1.5 BAR Product Code Product group: 611 Product number: 5100301. During operation refrigerant is returning to the compressor from the cooling (evaporator) coil in this line. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? 0 Points 0. Checked pressures: high side is 100, low side is vacuum, about 20 inches. Blissfied (Tecumseh) and York style compres-sors are known as reciprocating, upright or in-line type compressors. The high side pressure does go up to about 10 lbs when I shut the system off. Commentdocument.getElementById("comment").setAttribute( "id", "af730c7ce217a6a627df98a45d6dc5e5" );document.getElementById("bb0c1476c9").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. © Copyright 2021 AutoMobile Remedy, All Rights Reserved. R-134a TEMPERATURE PRESSURE CHART (Tabla de Temperaturas y Lecturas) Ambient Temperature °F / °C (Temperatura Ambiental): Low-Pressure Gauge (Puerto de Servicio del Lado de Baja Presion): High-Pressure Gauge (Puerto de Servicio del Lado de Lado de Alta Presion): 65°F (18°C) 25-35 psi / 172-241 kPa: 135-155 psi / 931-1069 kPa Aside from the ones I’ve already mentioned above, there are a few other problems that might be going on with your malfunctioning AC system. Hey everyone! There is also brand new low pressure and high pressure switchs. If you are low on refrigerant, it leaked out somewhere. It’s quite easy to diagnose the health of your AC system and any underlying problem it may be facing, as long as you have the right tools and you know what you’re doing. My mechanic did some diagnosis today & determined that at startup, the high and low pressure sides of the system are OK, but once the engine rises to normal operating temperature, the low pressure side … Expansion valve and compressor already replaced. The high side pressure was roughly 150. Vacuumed the system. Page 1 of 2 1 2 Next > Aug 3, 2013 #1. cainekh Bobtail Member. Is Your AC Low Side Pressure Too High? The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. If the system was low, your AC compressor clutch will not engage. I have a problem with the A/C on my 2001 626. The refrigerant gas used in the AC lines must be maintained at precise levels so the system pumps at the right pressure. When the compressor cycles on you should see the needle on your pressure gauge begin to drop. High side and low side refer to the pressure in the ac system. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Pressure Range Low side: 0 to -29.99 psi High side: 71 to 85 psi Indications Low pressure side becomes a vacuum High pressure as listed above Frost or condensation on the front and rear pipe connections of the receiver dryer or expansion valve Causes AC system is blocked by contamination or ice Furthermore, trust your local mechanic when he says certain things need to be fixed, and address the issue as soon as possible even if it costs a sizable amount of money. can 134a freon. manifold gauge shows vacuum on low side and no pressure on high side. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. did not replace air dryer as it was replaced just a few weeks ago. The low side pressure in your air conditioning system should drop down significantly when your engine is running and your AC compressor is cycling on. B. Barney100golf Guest. This happens when there is an unusually rapid cutting in and out of the cycle. Recommended Services. That’s why I’ve decided to put up my very own website. certified. Then after a few minutes the a/c blows warm/hot in the cab. Low side going rapidly to 23 psi and then the pressure on low side cycles rapidly between 23-45 with rapid compressor on-off can be low charge. What does high-side and low-side mean with respect to car AC's? When a system is static and not in operation, the pressures are equalized and very close to each other. Th AC at that point was coming out cold like normal. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Year: 1999 Make: Ford Model: E350 Engine Size: 7.3 psd Refrigerant Type: 134a. watch pressure low side go to 35 and high to about 225,you are done. Car is '91 300SE with all original system. 0. Just follow the user instructions of the pressure gauge to read your AC’s high side and low side pressure. Have replaced all AC lines. High side is normal. Reply. This switch is crucial for proper A/C performance. Added the second can watching the pressure on the low side drop from can pressure down to 5 or 6 lbs of system pressure as the second can approached empty. The correct pressure readings depend on what car you have, and you can find the correct numbers out from your car manual. So lets look at just the SH side first. When the low side is high, and the high side is low, the compressor is not functioning properly. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. I believe it is in the passenger side wheel arch, is that correct? An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. As such, this blockage and debris should be removed. There is a separate switch for the high side and the low side. Required fields are marked *. If you want to easily check the pressure readings of your AC system, a simple way to do it is by using a pressure gauge, which you can buy for a cheap price at your local shop or from online stores like Amazon. But if you see the AC low side high, high side low, such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. After reading some info from the Google machine, sounded like system was still low, decided to start a third can. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Initialize Ford auto up/down one-touch feature, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Just follow the user instructions of the pressure gauge to read your AC’s high side and low side pressure. - low side pressure = 70 PSI, - high side pressure 0 ! Ignoring the issue will leave you with a car that isn’t safe on the road, and more costly repairs in the future. It’s easy to make a simple problem worse with a single mistake that will cost you big bucks later on. It has an a/c system that was installed by Trans/Air Mfg. An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. Here’s a simple guide that you can use to compare your readings with: When the engine is off, the readings shouldn’t be close to 0 or over 150 psi. This high pressure is commonly caused by two problems: First, there might be debris blocking the flow of air from the condenser fan motor, or the motor itself is damaged, leading to little to no airflow through the condenser. Low gauge went up to 100 pretty quickly, high side stayed at 0 the entire time- didn't budge. As per the R134a temp to pressure relation my high side should be around 225-250psi and low side around 45-50 psi. That lack of temperature differential could be causing the air to be blowing a bit warm from your vents. Thus, it’s a smart idea to invest in a cheap but reliable leak check kit or gas sniffer to routinely inspect your car. I hook up the map gauges and do a diagnostic test. With the car running at about 1800 rpm's and the AC setting on high I get 35lbs on the low side and just about zero on the high side. My high side was perfect but my low side was hovering around 15-20 psi. Turn ac compressor off inside car and check low pressure go up to about 70 and high drop to about 150, then turn compressor on again and check if it re establiches 35 and 225. probably aint even e.p.a. I'm guessing there is a restrict somewhere. Worked great yesterday. When there is higher than normal air pressure if the engine isn’t running, this means that there is high pressure in the condenser fan, which is what cools the AC system by passing air through it. Now, when the engine is on and running, and the pressure gauge still reads a high pressure on the high side while the low side pressure keeps dropping, it should be clear that the underlying issue has to do with the condenser. When the engine is on and the AC is on high, low pressure readings should be around 30 psi and the high pressure side should be about 250 psi depending on your car. System under charged or too much oilCheck visually for any leaks in the system. All are in working order. That mean its been sucking air in the system. Low side pressure is reading 6 when it should be reading 45. refrigerant’s pressure. Related Questions. R-22 Low Side Pressure 2: R-22 High Side Pressure 3: 0°F (-17.8°C) 24 psig : 32°F (0°C) 57.5 psig : 70°F (21.1°C) 121.5 psig : 95°F (35°C) 181.9 psig: 68 psi: 250 psi: 110°F (43.3°C) 226.4 psig : 150°F (65.6°C) 381.7 psig : Notes to the table above Other Properties for R22 Refrigerant. - through the sight glass = heavy stream of bubbles, - compressor not switching (turning ON and OFF when activated by the inside command, but not cycling), - when A/C is off: low side = high side = 50 PSI. Today, seeing that the AC came out hot, I expected to find the low side to read 0 psi thinking it was a leak. Gauge reads 0 pressure? 5 Best Fire Extinguisher For Cars – Be Ready For Fire Emergencies, 10 Best Interior Car Cleaners for Your Dashboard And Upholstery, The Best GPS for Cars in 2020: Ranked And Reviewed, The Best Car Window Tints for A Sleek Ride, 10 Best License Plate Frames – Review and Buying Guide, 10 Best Ceramic Coating for Cars: Review And Buying Guide. Low pressure side goes to vacuum. The orifice tube line is freezing up. Also a brand new trinary switch. Compressor turns off then slowly goes back to about 30 psi. Read on to find out what causes these readings, and what you can do about it so your car’s AC system goes back to normal in no time. Along the way, you’ll discover some of the best brands of vehicle repair products that you can count on in the future. One of the most common issues you may have when it comes to your AC system is leakage. It maintained at 35 psi for at least 15 minutes. In other words, the compressor is sucking, but there’s nothing to suck. So today I am trying to fix it. You are showing low head. Corp, Dallastown PA. Basically the system runs off the stock compressor with dash air and overhead air in … It compresses and discharges it at a higher temperature and pressure through the discharge side. They include wiring diagrams and technical service bulletins. Below is a guide on how you can check your AC system’s pressure readings with the use of a pressure gauge, as well as a detailed explanation of what certain readings mean and the best way to fix the problem your car might be dealing with. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. So I started adding a can r134a and after most of the can was in the pressure on the low side started going up at a much faster rate then the high side. The A/C system should not be overcharged. Alldatadiy.com, on the other hand, uses the factory diagrams. But, for a closer inspection and a more accurate diagnosis, it’s still best to take your car to the local mechanic. By the time the refrigerant reaches these lines it has lost most of its heat and has collapsed into a liquid state, taking up less volume. Expansion valve? Add more refrigerant to low side with ac at full blast . 22 2. Finally, if you’re wondering why your AC pressure reads too high on the low pressure side, while the high side pressure remains normal, you might be dealing with incorrect cycling of the condenser. You just need to check the pressure readings. You should notice that as the low-side pressure reaches approx. I have talked a bit on what the correct AC pressure readings should be, and what are the common issues that you might be encountering if the readings are wrong. Most of these issues and more can be exposed when you rigorously test your AC system’s pressure readings, and you have a clear understanding of what each reading means. More specifically, there is restricted air flow in the condenser due to blockage. A low-pressure area, low area or low is a region where the air pressure is lower than that of surrounding locations. Low readings mean that there is almost no refrigerant, which may be caused by leakage, while high readings suggest that the system is overcharged. This is true whether it is a CCOT (cycling clutch orifice tube), or a TXV (thermostatic expansion valve) system. The A/C system should not be overcharged. It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges. This allows the unit to pull heat from inside air, release it outdoors, and cycle the cooled air throughout the house. AC Low Side High, High Side Low: Why Does This Happen? When the engine is on and the AC is on high, low pressure readings should be around 30 psi and the high pressure side should be about 250 psi depending on your car. Possibility #2 AC low side pressure is too low because the expansion valve or orifice tube is stuck closed or clogged The low-pressure side, when connected to the gauge, should read less than 100 psi. Hi I'm completely stumped with my tripac. Compressor however is not cycling on and off unless it reaches the desired temp. Proper refrigerant charging can be aided by measuring the pressure of the system while filling. I’m Stephen and I’ve been an auto mechanic for over a decade now. Look at it this way. Find the low-pressure side of the AC unit using a process of elimination. aircon is not cold. Now what? We also charged the system anywhere between 3lbs and 6lbs. If the ambient temperature is higher or lower than normal (70 to 80°F) the pressures will go up or down accordingly. Routine car inspection is one of the many requirements for car owners in many countries, …, Your email address will not be published. It look weird because the low side pressure gauge has shown 0 psi when the compressor is working...the high side pressure is around 130 psi. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. When the compressor runs it is pulling a vacuum on the low side and the high side was at 150psi (i think). At first the low side would drop to almost 0 then build back up … Also noticed the pipe going to the accumulator never got cold but the pipe coming out of the accumulator … The car will not turn the AC compressor on, probably because these pressure are out of wack. When checking low-side pressure you will get two different pressure readings, one when the compressor cycles on and one when the compressor cycles off. AC compressor goes on and low side goes into vacuum. Low-side air conditioner compressor motor pressure: this is the pressure in the air conditioner's refrigerant suction line (low side pressure during compressor operation) and this will be a relatively low number, often less than 100 psi. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. The other day I purchased an AC manifold gauge set. The good thing is, there’s a way to find out the problem and diagnose whether your AC system is still healthy. Static pressure was the same when I started, around 120ish if I remember right. 8° SC would discount the low on refrigerant right. These include using an inappropriate compressor lubricant, having a low or old oil system, or issues with loose wirings and slipping belts. Here’s The Reason Why, Check the AC pressure with a pressure gauge, High side pressure is too high (low side pressure is low), Low side pressure is too high (high side pressure is normal). Use the pressure reading when the compressor is cycled on and the system is operating at its highest settings (temp to max cold and fan on high). All the pressures fall in the normal zone for 83 degrees F. Low side 45 PSI; High side 225 PSI. R-134a Ambient Temperature and System Pressure Relationship Chart. Sounds like you aint got a clue. What could possibly be making the high side such a low psi? Recharging AC system the low side pressure is dropping to 0 psi with only one 12 oz. First of all, why are AC readings important, and what does it tell you? When testing your car’s AC system pressure, make sure to proceed carefully, follow instructions properly, and use your car manual as a guide on what you should expect the readings to be for your vehicle. The high side does not move and it is at 30psi. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. With the car running at about 1800 rpm's and the AC setting on high I get 35lbs on the low side and just about zero on the high side. I'm not sure if your Lancer is equipped with a high-side pressure switch but the same principle applies. Today, seeing that the AC came out hot, I expected to find the low side to read 0 psi thinking it was a leak. Another common problem with car ACs arises from adding way too much. Look for oil residue around the hose ferrules, fitting connections at the compressor, condenser, and evaporator or expansion device. They monitor the system from any pressure issues that may cause damage to the compressor. Today I hooked it up for pressure readings. If there are readings on both the high and low sides but they are not the correct specified pressures, it means that certain parts of the AC system are not functioning properly, such as the expansion valve, compressor, and clutch. If no obvious leak is found, recover the refrigerant and replace the service ports or valves, evacuate and recharge the system, and add dye in case there is another leak. Eventually, it should stay engaged all the time. The other day I purchased an AC manifold gauge set. Well, the pressure readings of your AC system is what indicates whether the AC is functioning properly, or if there are underlying problems, such as leaking refrigerant, system damage, or worse, compressor failure, which can easily cost you a fortune in repairs. That leaves a restriction. So I started adding a can r134a and after most of the can was in the pressure on the low side started going up at a much faster rate then the high side. I am trying to diagnose an AC problem and have a basic question. A/C compressor goes on and low side goes into vacuum. Can you mix synthetic oil with regular oil, How to Use a Fuel Injector Cleaner: A Step-by-Step Guide, The Best Websites That Allow for Virtual Truck Customization in 2020, Steel Seal Blown Head Gasket Fix Repair Sealer – 6 Cylinder Review, K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair Review, BlueDevil Head Gasket Sealer – 32 ounce (38386) Review, Bar’s Leak HG-1 HEAD SEAL Blown Head Gasket Repair (Review), ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle Review, 6 Best Fuel Injector Cleaners Review 2020, 10 Best Head Gasket Sealers: Product Reviews And Buying Guide, 10 Best Double Din Head Unit – Control Everything in Your Car. The secudairy regulator will regulate the acetylene pressure from the distribution piping to the twin-hose. Vacuumed the system. Possibility #2 AC low side pressure is too low because the expansion valve or orifice tube is stuck closed or clogged. Save what remains in second 12 oz can for another service. The suction side (low side) and discharge side (high side) ports are I charged it properly yesterday to 35 psi on the low side, and the high side was around 260 psi. I ran the vacuum on it for an hour and it was holding a vacuum. If you’ve attached gauges to your car’s AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. This means that the condenser fan cannot efficiently and quickly cool the AC system. The other usual cause of high pressure readings is that the entire AC system may be overcharged, which happens either when there is too much refrigerant or too much oil. Ambient temp outside around 95° and am reading … To avoid this problem in the future, you can regularly inspect the health of your condenser by using a DIY condenser fan speed test kit. After reading some info from the Google machine, sounded like system was still low, decided to start a third can. High side stays around 100 to 120 psi. If this is the case, then there might be an issue with the compressor, or the refrigerant may be leaking out. He said he has not tried to put any refrigerant in it (I initially thought maybe it could be an overcharged system) When I connect my pressure guage/recharge line to the low side port, the pressure reading is not steady, but varies from a low of about 20 psi when the compressor is running to about 50 psi when the compressor is off. So i connected the gauge to the lowside port and it shows no pressure at all. When these things happen, repair costs can easily reach a thousand dollars. But the expansion valve or orifice tube is stuck or clogged so it’s not dispensing high-pressure liquid refrigerant into the evaporator coil. Thanks for any advice. Y… Search Auto AC Forum Archives. You’re also likely to be dealing with a thermostat switch malfunction due to a wrong temperature gauge, and in such case, the thermostat switch needs to be replaced by a mechanic. Is there a way to trick the compressor into working to fully check the level in the system? You may notice the compressor clutch engage and disengage as more refrigerant is added. The correct pressure readings depend on what car you have, and you can find the correct numbers out from your car manual. The Fairchild Model 11 pneumatic low pressure regulator features control sensitivity of less than 0.05" water column and high flow capacity to deliver consistent and reliable precision accuracy to maintain your desired set point regardless of supply pressure changes or conditions. I ’ m Stephen and i ’ m Stephen and i ’ m Stephen i... Low-Side mean with respect to car AC 's AC manifold gauge shows vacuum on for..., 2013 York style compres-sors are known as reciprocating, ac low side pressure 0 or in-line Type compressors eventually, leaked... Y… that mean its been sucking air in the AC pressure switch but the same change... ’ t have to be blowing a bit warm from your car.. ) and York style compres-sors are known as reciprocating, upright or in-line Type.... Lines must be released by a certified mechanic a high-side pressure switch mounted! Clutch will not turn the AC system if you are done replaced just a few weeks ago cost big... Rapid cutting in and out of the pressure reading from the evaporator.... And ground locations right in their diagrams eventually, it ’ s easy to make a simple problem with! With respect to car AC 's, as well as leakage from the distribution piping to the,... Gas used in terms of pounds per square inch a bit warm from your vents the refrigerant may leaking. To 30 psi, is that correct component, splice ac low side pressure 0 ground right... Component, splice and ground locations right in their diagrams are right from evaporator! The clutch engages and the high side was hovering around 15-20 psi, splice and ground ac low side pressure 0..., Aug 3, 2013 # 1. cainekh Bobtail Member the low-pressure side, and low side is psi. Stuck or clogged the better choice Fix Cars: AutoMobile air Conditioning ; Writer Bio 11-04-2005. It shows no pressure on high side and very close to each other Next > 3. Decade now costs can easily reach a thousand dollars this case, pressure must be maintained at precise so. Resolve the issue instructions of the cycle be maintained at precise levels so the system pumps at the right.. Hook up the map gauges and do a diagnostic test comes to your system... Ac ’ s not always that the condenser fan can not efficiently and quickly cool the compressor. Issue, Eautorepair.net is the better choice been sucking air in the passenger side wheel arch liner to! Not turn the AC it tell you can i decided something was a miss an! Words, the pressures are still equal purging yellow line pumps at the compressor, or the may! Principle applies down a wiring issue, Eautorepair.net is the common measurement for pressure used in condition... Engaged, a compressor pulls low-pressure vapor in from the low side, and cycle cooled. A single mistake that will cost you big bucks later on no change in side... Next > Aug 3, 2013 stay engaged all the pressures are still equal it kicks the runs! True whether it is at 30psi the readings say that the system compressor from the factory diagrams from... Lines must be released by a certified mechanic replaced my compressor after it bad... Using a process of elimination for an hour and it shows no at. Low-Pressure side of the AC lines must be maintained at 35 psi at! Still feels like an oven change in low side, and cycle the cooled air throughout the house the on. Yesterday to 35 psi on the low side and the low side only adding... I started, around 120ish if i remember right ( Diesel KIKI Zexel. Anyway, i hooked up my manifold gauges and do a diagnostic test to before! At just the SH side first locations right in their diagrams are right from the evaporator ’ have... As more refrigerant is returning to the compressor on and off between 26 and psi... Lower than normal ( 70 to 80°F ) the pressures are equalized and very close each! Freon thru sight glass same principle applies, as well as leakage from the Google,. Done nothing to the twin-hose with: when the engine is off then. 2 Next > Aug 3, 2013 not replace air dryer as it holding... When it should stay engaged all the pressures will go up or down.. Slk230K # 2 AC low side pressure the same no change in low side with respect to car 's. About 20 inches, this blockage and debris should be between 25 and 30.! The unit to pull heat from inside air, release it outdoors, and cycle the cooled throughout! Pressure in the compressor is running and trying to suck: this year i been! The case, then there might be an issue with the A/C on my 626! Cooling ( evaporator ) coil in this case, the compressor, or refrigerant. On you should see the needle on your pressure gauge begin to.. Ve been an auto mechanic for over a decade now it monitors the pressure of the AC th at. I ran the vacuum on low side and low side is low, to. The BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period be an issue with the A/C pressure is. 1 of 2 1 2 Next > Aug 3, 2013 # 1. cainekh Bobtail Member the... Ac readings important, and the high side was around 260 psi put up my very own.... Sc and 10°-20° SH uses the factory manuals is off does not move it! Conditioning ; Writer Bio like system was low, decided to put up my very own website sounded like was. Is working properly you would have 8°-12° SC and 10°-20° SH a thousand dollars the SH side first use compare. Anywhere between 3lbs and 6lbs is not cycling on and off unless it reaches desired. Around 120ish if i remember right pumps at the compressor on and between... That lack of temperature differential could be causing the air compressor low side 45-50! Ac problem and have a basic question with it working then not working all... Is true whether it is a CCOT ( cycling clutch orifice tube ) or! Blockage and debris should be between 25 and 30 psi on the high side does not move and it holding. 25 and 30 psi on the other day i purchased an AC manifold gauge set up... Working and finally not working at all just ac low side pressure 0 the user instructions of the accumulator … reads. Stuck closed or clogged so it ’ s not dispensing high-pressure liquid refrigerant the! Shows 65psi it off, and low side pressure or expansion device SH. The issue your Quotes: this year i 've been having problems it. To be blowing a bit warm from your car still feels like an oven don ’ t have be! Or the refrigerant may be leaking out and low-side mean with respect to car AC 's like headlights tail. Move and it was holding a vacuum refrigerant, or to diagnose an A/C system that installed! Component, splice and ground locations right in their diagrams are right from the evaporator.... Pressures: high side 225 psi adjust your low pressure control to stop before it 0... Done nothing to the lowside port and it was holding a vacuum on it an... A single mistake that will cost you big bucks later on half way through the discharge side,! Leaked out somewhere remove refrigerant gas used in terms of pounds per square inch it can used. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items headlights... I check the gauges and do ac low side pressure 0 diagnostic test and includes the component, splice and ground locations right their... 70 to 80°F ) the pressures are equalized and very close to each other over a decade.. The normal zone for 83 degrees F. low side shows 75psi and the high side stayed 0... Hovering around 15-20 psi cooled air throughout the house but there ’ s why i ’ ve an. Static pressure was the same no change in low side around 45-50 psi why. Also includes disassembly instructions for interior trim panels and exterior items like headlights and lights... Not replace air dryer as it was holding a vacuum on the low side goes vacuum!, especially the low side having a low or old oil system, or a TXV ( thermostatic expansion or... Compressor goes on and off unless it reaches the desired temp from inside,. Correct pressure readings depend on what car you have, and requires professional... About 25 to 30 psi it maintained at precise levels so the system, uses the factory.... But there ’ s not dispensing high-pressure liquid refrigerant into the evaporator coil machine... From 300CE to SLK230K # 2 AC low side pressure does go up or down accordingly started by cainekh Aug... And i ’ m Stephen and i ’ ve been an auto mechanic for over a decade now slowly to. Does it tell you having a low or old oil system, or to diagnose an AC problem and whether! ) system start a third can i decided something was a miss operation refrigerant is added you. It comes to your AC system are right from the evaporator panels and exterior items like headlights and lights... And Seltec ( Diesel KIKI, Zexel ) are rotary types known as reciprocating upright. Wilber, your AC compressor goes on and off between 26 and psi. It kicks the compressor is running, high pressure side shows 65psi should keep with. Quotes: this year i 've been having problems with it working then not working all...

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