Question about 1998 Volkswagen Jetta

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A/c issue I just bought a 1998 Jetta TDI. The previous oner said a/c needed charging. I checked the system with a guage and it reads high pressure( on low pressure side). Fans work well, when you push a/c button sounds like compressor is working, but no cold/cool air. What now?

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I just replaced the Volkswagen/Audi Auxiliary Fan for $26.86 (Control Unit # 1J0 919 506 K)... FIXED THE PROBLEM!!!
Originally I had: Both fans and compressor not working, all fuses good, and all grounds good, and an extremely high 134a pressure on both the High and Low side. I bought the part on eBay, swapped it out, and instantly problem solved!
(Side note) I discovered that one fan is not working correctly (which I will address later), however the A/C is working GREAT again!

Posted on Jun 14, 2012

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Could be a couple things - one, if the fan switch for the AC condenser is not working, it'll keep the AC from kicking on, but that's usually seen by the compressor not coming on. When you activate the AC, do your RPM drop down at all? It should. If it does, the compressor is kicking on and you probably have a problem with the expansion valve, which is what flash chills the air. The car is pumping freon around but it's not cooling enough to cool the car. That's likely an expansion valve problem.

If you turn it on and the revs don't dip down momentarily, the compressor isn't coming on, and it could be the fan switch underhood or the AC relay.

Posted on Aug 29, 2008

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