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99 VW Cabrio - No Cooling = Unhappy Wife

Tennessee_Timmy on Mon June 28, 2010 8:24 PM User is offlineView users profile

Year: 1999
Make: Volkswagen
Model: Cabrio
Engine Size: 2.0 L
Refrigerant Type: R134a
Ambient Temp: 88F
Pressure Low: 25
Pressure High: 88
Country of Origin: United States

Static Pressure with "cold" car - 100 psi

After running for a few minutes:

TXV moderately cold.
Receiver/Drier inlet slightly above ambient
Receiver/Drier outlet slightly below ambient

Compressor - SD7V16, with Audi / VW logo
Pressure relief device - not actuated.

Thanks in advance for the input (other than advising her to put the top down to cool off - ouch!).


-------------------------
Good Luck 2 ya,
Timmy

mk378 on Mon June 28, 2010 9:01 PM User is offline

Is the high side port after the receiver-drier? If so, could be blocked receiver drier. Hard to otherwise explain how high side could ever be lower than static pressure.

Also it's likely badly undercharged.

The variable compressor regulates the low side to 25 psi over a wide range of operating conditions. So it looks like that feature is working OK. It is a common problem for those compressors to get stuck at minimum displacement but yours seems alright for now. Really in order to make a diagnosis of a variable system you have to start with an evacuate and charge by weight.

Edited: Mon June 28, 2010 at 9:04 PM by mk378

Tennessee_Timmy on Mon July 05, 2010 10:33 PM User is offlineView users profile

Recovered
Added .75 oz PAG-46 oil w/dye, vacuum for 45 minutes, add 29 oz of refrigerant.

Ambient temp - 84F
Pressures - 29 / 215 at idle, 25 / 160 at 50 mph (yeah, got some odd looks with my gauges taped to the windshield, but who cares!?)
Vent temps - 38F

She's happy for the time being, now the "leak watch" begins.

Thanks for the input.

-------------------------
Good Luck 2 ya,
Timmy

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