Question about 1997 Volkswagen Jetta

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Hi, I am trying to refill the AC refrigerant on my 1997 VW Jetta but I'm not sure which on of the valves is the low side valve. Anybody know the answer to this?? Thanks.

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The high and low valves are usually different sizes, so whichever one the refill hose fits on should be the right one. It's easy enough to see if they're different.

Posted on Aug 01, 2009

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Red is High Side,

Posted on Aug 01, 2009

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Posted on Jan 02, 2017

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1 Answer

How to fine the low port vaule to recharge air condition ?


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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.

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Your car uses R-134A, readily available at most auto parts stores. Best bet is to get a refill kit that includes the refill hose (get one with a pressure gauge attached if possible to ensure you don't overfill the system). Recharging is pretty straight forward. Turn the car on with the AC on HIGH, locate the low side AC line (will have a screw on cap). Attach the refrigerant to the hose but don't puncture the can until the other end of the hose is attached to the low side valve. Once both ends are attached, turn the screw on the hose to puncture the can of refrigerant; the car should suction the refrigerant out of the can. Disconnect the hose when the can's empty and check the vents on the AC. If its cold and frost develops on the AC lines under the hood, you're good to go. Best of luck and post back with any questions.
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1 Answer

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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...

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Flushed system replaced compressor, expansion valve and drier, evacuated system then let set overnight to check for leaks now replacing oil then I will charge the air.

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1 Answer

Where and how do you refill freon on a VW 2001 Jetta?


if the ac system was functioning under a vacuum (it should be), the can should have gotten cold, is there already pressure in the system before you tried ti fill? you have the correct connection if it had a blue cap. it sounds like a possable restricted oriface tube...the instructions will come with new part, USE CAUTION r-134 system repairs can be very dangerous, be sure to remove and store refrigerant before repair...good luck, marty

May 27, 2009 | 2001 Volkswagen Jetta TDI

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