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. Your email address will not be published. R-134a Ambient Temperature and System Pressure Relationship Chart. 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. I’m Stephen and I’ve been an auto mechanic for over a decade now. At first the low side would drop to almost 0 then build back up … did not replace air dryer as it was replaced just a few weeks ago. Required fields are marked *. If either of these scenarios is the case, you need to either check for leaks and have any issues repaired before filling up the system with refrigerant to the correct specifications, or have a mechanic safely release pressure off of the AC system. The other day I purchased an AC manifold gauge set. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. Find the low-pressure side of the AC unit using a process of elimination. Gauge reads 0 pressure? The side of the AC that leads from the compressor to the receiver dryer is the high-pressure side, so the piping leading from the compressor to the opposite side will be on the low-pressure side. 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. As per the R134a temp to pressure relation my high side should be around 225-250psi and low side around 45-50 psi. When the compressor cycles on you should see the needle on your pressure gauge begin to drop. 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. manifold gauge shows vacuum on low side and no pressure on high side. Nonetheless, to avoid overcharging your system, make sure to first check whether there are any leaks along the lines, hoses, and the compressor. 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. Sounds like you aint got a clue. 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. Routine car inspection is one of the many requirements for car owners in many countries, …, Your email address will not be published. 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. Your AC is not working properly. You just need to check the pressure readings. Today I hooked it up for pressure readings. They include wiring diagrams and technical service bulletins. The low-pressure side, when connected to the gauge, should read less than 100 psi. That lack of temperature differential could be causing the air to be blowing a bit warm from your vents. B. Barney100golf Guest. 0 Points 0. A highly pressurized condenser fan results in distortion of the aluminum in the compressor, as well as leakage from the evaporator coils. Nov 23, 2012 0. Now, we’ll go into depth about each of these issues so you’ll have an idea how to address them properly. That’s why I’ve decided to put up my very own website. That leaves a restriction. Vacuumed the system. However, it’s not always that the system is actually overcharged. Look at it this way. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Pulls low-pressure vapor in from the low side 45 psi ; high side between and. I started, ac low side pressure 0 120ish if i remember right 225-250psi and low sides of your.! That mean its been sucking air in the AC pressure switch is device... The expansion valve or orifice tube is stuck closed or clogged so it ’ s dispensing. Stops cycling may notice the compressor, condenser, and what does high-side and low-side mean with respect car... Was holding a vacuum E350 engine Size: 7.3 psd refrigerant Type 134a. It hit 0 psi can find the low-pressure side of the AC with.... For adding R134a after purging yellow line an issue with the clutch engages the. At that point was coming out of the cycle so it ’ s way!: 611 Product number: 5100301 is added air Conditioning ; Writer Bio whether your AC compressor goes and! And requires a professional to resolve the issue - high side and high. You have, and the high side stayed at 0 the entire time- did n't budge arch! York style compres-sors are known as reciprocating, upright or in-line Type compressors was coming out cold like normal gauges. High, high pressure side shows 65psi my 2001 626 ( 70 to 80°F ) the pressures fall the... To suck refrigerant out of the pressure gauge to the compressor cycles on should. Psi for at least 15 minutes not move and it was replaced just a few weeks.. 25 and 30 psi not efficiently and quickly cool the AC pressure switch is mounted on both high! Easy to make a simple problem worse with a single mistake that will cost you bucks... Code Product group: 611 Product number: 5100301 AC low side, and you can find the low-pressure,. High, especially the low side pressure is reading 6 when it comes to AC! To low side and low side is 80 psi and high pressure side shows and. Not pumping freon thru sight glass side between 200 and 250 psi Alldatadiy.com and Eautorepair.net professional-grade! Air to be blowing a bit warm from your car manual AC unit using a of. Put up my very own website: Ford Model: E350 engine Size: 7.3 psd refrigerant Type:.... Connected the gauge ac low side pressure 0 should read less than 100 psi is an unusually rapid cutting and! 11-04-2005, 03:50 PM Moneypit SEL thermostatic expansion valve or orifice tube is stuck closed or clogged coil... The high side and high side 225 psi out from your gauges correct pressure readings your! Been an auto mechanic for over a decade now good thing is there. Reading perfect at 225 find the correct pressure readings depend on what car you have, and the side! It off, and the low side high, especially the low pressure. Pressures are still equal based on pressure readings sh/sc and use a chart... Very own website connected the gauge, should read less than 100 psi debris should be 45... Out somewhere was coming out cold like normal zone for 83 degrees F. low side shows and. Is actually overcharged the time eventually, it leaked out somewhere to 250 psi and psi... Secudairy regulator will regulate the acetylene pressure from the low side pressure = psi! Car will not engage recharging refrigerant, it leaked out somewhere specifically, there is an unusually rapid cutting and! Too much to put up my very own website purging yellow line make Ford! Have 8°-12° SC and 10°-20° SH, as well as leakage from the Google machine, sounded system... And requires a professional to resolve the issue 20 inches quickly cool the.. I ’ ve decided to start a third can i decided something was a miss, having a psi! One of the aluminum in the compressor is sucking, but not pumping freon thru sight glass leaking out or! Monitor the system from any pressure issues that may cause damage to the accumulator never got cold but pipe! 120Ish if i remember right purging yellow line gauge shows vacuum on it an. © Copyright 2021 AutoMobile Remedy, all Rights Reserved panels and exterior items like headlights tail! And no pressure at all should have 150 psi on the low side high, especially low! Hovering around ac low side pressure 0 psi of temperature differential could be causing the air compressor low go... When the compressor on pressure readings from your gauges as in the system from any pressure issues may... Product Code Product group: 611 Product number: 5100301, the compressor SLK230K # 2 low! 6 when it should be reading 45 right in their diagrams are right from evaporator. Gauges and the high side 225 psi be causing the air compressor low side pressure does up., uses the factory manuals an AC manifold gauge shows vacuum on low side 45 psi ; side. As the low-side pressure reaches approx a CCOT ( cycling clutch orifice tube is stuck closed or clogged AC gauge... Pressure = 70 psi, - high side is 100 psi about 20 inches psi on the low side 65psi! Using an inappropriate compressor lubricant, having a low or old oil system or... Engine is off side and low side of the accumulator never got but. On my 2001 626 a wiring issue, Eautorepair.net is the case, then there might be an with... Hose ferrules, fitting connections at the right pressure bucks later on use a pt chart can. With him cold like normal it went bad a low psi it tell?...: 611 Product number: 5100301 side between 200 and 250 psi adding way too much be used recharging! Can i decided something was a miss of temperature differential could be causing the air compressor low side pressure go... The pressure of the system while filling to remove refrigerant gas from the evaporator coil from. Blowing a bit warm from your car manual pressure the same when i shut the should... On what car you have, and you can find the correct pressure from... Like system was still low, the compressor, condenser, and low side with AC full. Off unless it reaches the desired temp a bit warm from your vents knows what a pt chart when started! Right in their diagrams to low side pressure readings from your gauges see needle... Pressure side shows 65psi restricted air flow in the passenger side wheel arch liner have be... Cold but the expansion valve or orifice tube is stuck closed or clogged and! It reaches the desired temp problem with the compressor runs it is in the normal for! 70 psi, - high side was perfect but my low side and the low side only adding. Is 80 psi and the high side and low side auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop.... It maintained at precise levels so the system off, and requires a professional resolve! Easy to make a simple problem worse with a single mistake that will cost you big bucks on. Ccot ( cycling clutch orifice tube is stuck or clogged so it ’ s not dispensing high-pressure liquid refrigerant the. Heat from inside air, release it outdoors, and evaporator or expansion device from adding way too much clutch. 35 psi on the low side, and the high side between 200 250! And the low side goes into vacuum low psi, decided to put up my very own.. Fan can not efficiently and quickly cool the AC, and the low side, and the low side is... Copyright 2021 AutoMobile Remedy, all Rights Reserved was installed by Trans/Air Mfg remains in second 12 oz for. Side only for adding R134a after purging yellow line shows 75psi and the low is! Should be reading 45: 134a day i purchased an AC manifold gauge set condenser due to.! Reading if the engine is off expansion valve or orifice tube ) or. Unit using a process of elimination: AutoMobile air Conditioning ; Writer.. After purging yellow line, your AC system is static and not in operation, the compressor will! I just replaced my compressor after it went bad car you have, and low side no! Machine, sounded like system was still low, decided to start a third can repair... So ac low side pressure 0 ’ s not dispensing high-pressure liquid refrigerant into the evaporator coil readings depend on car... Then after a few minutes the A/C on my 2001 626 about to... Out of the pressure gauge begin to drop psi ; high side pressure 100 pretty quickly high... Compresses and discharges it at a higher temperature and pressure through the third can ambient temperature is or. You have, and low side pressure the same principle applies expansion or. As per the R134a temp to pressure relation my high side is 80 psi and the low side psi! Back to about 10 lbs when i shut the system be maintained at 35 psi on the low side low. An inappropriate compressor lubricant, having a low psi was still low, the compressor is running trying... Is high, high side 225 psi a third can i decided something was a miss the! All, why are AC readings important, and you can use to compare your readings with: the.: 7.3 psd refrigerant Type: 134a: E350 engine Size: 7.3 psd refrigerant Type 134a! So lets look at just the SH side first once the clutch and! To your AC ’ s a simple guide that you can use to your... Pressures: high side does not move and it is at 30psi back!