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Discussion Starter #1
Hi all,
I have a 2006 Jetta TDI sedan with an annoying problem: the a/c compressor does not kick in until I have been driving for some 10-15 minutes. After that the a/c becomes plenty cold. Idling doesn't seem to help. I'm afraid this may be a real problem in Houston with summer weather on the way -- those 10-15 minutes can get very uncomfortable.

My mechanic thinks it's the a/c clutch, and says that since the clutch is internal to the compressor I need to replace both, along with the evaporator and flush and fill, etc. for about $1100 total. He also said he's seen it before on one or two other VW TDI's, and I'm sure I've seen a reference to something like this on a forum some time back, but can't find it now.

Has anyone else experienced this?
 

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I read something that the nut comes loose but I'd check the pulley and belt tension. Maybe the tensioner is loose? If there is some electrical problem maybe it's preventing the AC from kicking in.
 

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Discussion Starter #3
Thanks for the reply, Gruppe. I've ruled out things like belt and tensioner, since that would still cause problems after the car is warmed up (and the a/c works fine then). An electrical problem may be a bit more likely, though my mechanic says the compressor is getting the correct signal and should engage but doesn't.

I'm wondering if these cars have some sort of temperature sensor that would prevent the a/c clutch from engaging in cold weather. If so, I'm thinking that this sensor could malfunction so that it's set far too hot -- i.e., doesn't allow the compressor to engage until the engine is at full operating temperature. If so, then that would explain my symptoms, and replacing the compressor etc. would be the wrong thing to do. Sound plausible?
 

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FYI the A5 compressor has no clutch. There's a valve internal to the compressor. If the valve is bad replace the compressor. Obviously it will need to be evacuated with a new dryer installed.

There's a high pressure sensor on the condenser and an AC control module. If you have a VCDS, these should show an error code. It sounds more like a mechanical problem though. Before replacing it, find an AC shop or a garage which has a mechanic who will look at it and not a tech.
 
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