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How can I be sure which valve is the low side when recharging the AC?

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The valve coloses to the firewall will be the low side, the one nearest the compressor will be the high side.

Posted on Aug 20, 2010

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1 Answer

Where is the low port located in the engine to recharge the ac for a 2008 Chevy Malibu LTZ 3.6 v6


The low pressure side to the ac will be the Schrader valve that is the smallest size. If you are recharging it yourself try to fit you valve on both valve and you will see what I am talking about.

May 04, 2015 | AC Cars & Trucks

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Mazda6 ac recharge valves


the correct one should be smaller, and your recharge hose should be only able to connect to it. the smaller fitting is the low side, and the larger fitting is the high side. recharge only to the low side. the high side is used by technicians with elaborate ac manifold guages to monitor success. these guage kits can be bought at harbor freight for about 55 dollars,and give a better recharge,as you can regulate pressure as not to overfill, which lessens the cooling

Jun 29, 2013 | Cars & Trucks

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When putting freon in my 01 saturn there is a high input valve and a low input valve, which one do i put the refrigerant in/


You put the freon on the low side, it may have a blue cap to let you know its the suction side.

its usually closer to a long round canister called the dryer or accumulator. when putting freon

make sure to run your ac on high while you are recharging the ac. good luck!

Jun 25, 2011 | Saturn L-Series Cars & Trucks

1 Answer

How do i tell the low side from the high side on the ac system


The low side has a black cap covering the recharge valve. Even if you tried to place the recharge hose on the high side, it will never fit and is designed for the use of a totally different hose fitting.

Aug 17, 2010 | 2006 Jeep Liberty

1 Answer

What hose do i connect the 134 refrigrant to recharge the ac on a 2002 Montero Sport


you connect to the low preasure side, the connections are two diffrent sizes, the hose to recharge only fits the correct low preasure valve, it wont fit the wrong valve, hope this helps.

Apr 01, 2010 | 2002 Mitsubishi Montero Sport

1 Answer

I need to retrofit and recharge my 1988 Dodge Ram Ac.


First, the old R-12 must be completely evacuated fromt the system. R-12 and R-134A do not mix and won't function together. Once you are sure there's no R-12 left in the system, you need to install an R-134A fill valve on the low side AC line. This is where your refill hose will connect to add R-134A. Once the valve is in place you're ready to fill the system. The compressor requires a minimum of 20psi to engage and should not be filled to more than 45psi.

RECHARGING AC SYSTEM

1.Turn the truck on and turn AC on HIGH
2.Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
3.Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
4.Insert the other end of the refill hose to the low side valve
5.Puncture the R-134A can with the screw on the refill hose
6.You should feel the system suction the refrigerant out of the can
7.Check for frost on the AC lines and the air blowing inside the truck
8.If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective
Hopefully this answers your question and you're able to get your AC working again. Best of luck.

Jul 21, 2009 | Dodge Ram 150 Cars & Trucks

2 Answers

Hi, my husband and i have a 2006 optima. te ac


Absolutely not!  Never attempt to recharge from the high side. Recharging from the high side is extremely dangerous and could do harm to both you and the car.  If the low side pressure is only 10psi, you are low on refrigerant.  Most cars require 20psi to operate the compressor and should never fill to more than 40-45psi unless recommended by the manufacturer.  I'd re-check the pressure readings.  It's possible that instead of charging the system, while hooking up the hose, you've let freon escape, accounting for the hissing noise and the low pressure reading.  When recharging the AC system, it's important to have the car running and have the AC on high.  It's possible, you didn't have a good connection to the low side which also would account for the escaping refrigerant.  I hope this answers your question.  I'd try to recharge the system again on the low side, making sure the connection is good both at the low side valve and on the can of refrigerant.  Best of luck.
Greg

Jun 27, 2009 | 2005 Kia Optima

1 Answer

Ac highside charge line location


the high side should have a black cap with a letter H on it.... if you dont see it then look for 2 valves that have caps on them, the larger of the valve is the high side, the smaller is the low side, the low side is the only one you want to use if you are refilling the system you do not want to mess with the highside... the low side pressure makes it so you can recharge the system, the highside will not work to refill a system if you are using the store bought recharging systems... and the valve on the recharger will only fit low side... hope this helps you... the highside should be on the pass. side towards the rear o the engine...

Jun 23, 2009 | 1997 Volvo V90

2 Answers

AC Recharge


Follow your line back from the AC pump, and look for a blue cap. About twice the size of a tire valve cap. That's your low side where you add.

Jun 12, 2009 | 1999 Oldsmobile Intrigue

2 Answers

AC has stopped blowing cold air. Compressor is working. Where is the recharge valve located?


There are two A/C refrigerant lines. The small line is your high pressure line and the larger line is your low pressure line.
Start at the fire wall and follow the "large " low pressure line to the compressor. The low pressure charge port will be some where on that line.
DO NOT try to recharge on the high pressure side ( small line )
Good luck, let me know.
Regards,

Apr 26, 2009 | 2001 Saturn L-Series

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