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VW Jetta AC Woes

Performance Kote on Wed September 10, 2008 2:19 PM User is offline

Year: 2001
Make: VW
Model: Jetta
Engine Size: 2.0
Refrigerant Type: R134
Ambient Temp: 92
Pressure Low: 40
Pressure High: 150
Country of Origin: United States

AC temps have increased to 65-70F and my pressures are 40 on the low and 150 on the high . COmpressor cycles properly and both fans are working . It seems that my low pressure may be a little high and thet high is low . I was told that this is indicative of an expansion valve not working properly . Also there have been small amounts of foam blowing out of the vents . Any ideas .compressor or expansion valve .

mk378 on Wed September 10, 2008 3:15 PM User is offline

Your car has a variable displacement compressor. The charge must be correct to diagnose it properly. Recover and recharge to the specified amount by weight. You will probably find it works OK then, indicating it was low on refrigerant due to a leak.

bearing01 on Wed September 10, 2008 3:31 PM User is offline

Pressures 40/150, is this at idle or above 1500 engine rpm?

When it's 75'F outside, on the highway with rpm above 1500, I get 30/150 psi. However, at idle my low side pressure tends to creep up around 40 also. This is on my new SD7V16 compressor.

bearing01 on Wed September 10, 2008 3:40 PM User is offline

Oh... I just saw that your ambient temperature is 92'F.

You should still have around 28 to 30psi low side pressure when above 1500 rpm, but your high side should be at least 190-200psi at those temperatures.

Foam blowing out the vents... as in sponge? Could be a foam seal around the evaporator is starting to come apart... not that big a deal.

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