Question about 2004 Volkswagen Passat

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I have a 2004 Volkswagon Passat with the 1.8T engine. The air conditioner is not working. I have checked the line pressure(s) and have around 75 psig on both the suction and discharge lines (appears the pressure has equalized across the compressor). I have checked voltage at the compressor connection and there is voltage going to the compressor. I have also checked continuity and the ground is good as well. I cannot locate a suction pressure switch to see if it is bad or not. Also, I have found the relay panel but cannot tell which relay controls the a/c. Any help would be appreciated.

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  • Master
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Need more information. Saying it does not work is not very informative. Does the compressor just not cool? is it cycling or not cycling. If you find it is not cycling but the fuses are ok. Check the clutch for continuity. It could be that the windings are burned out.

Posted on Jul 28, 2010

  • tpustka Jul 28, 2010

    The clutch will not engage at all. The blower is working (blowing ambient temperature air). There only seems to be one wire at the compressor that mhas voltage. I read where some models only have one wire and to check continuity check the center of the compressor housing to a good ground. I have done this and the ground appears to be good.

  • Bryan Fullerton
    Bryan Fullerton Jul 28, 2010

    1. you have checked that it has voltage with the AC switch on and has no voltage with the AC switch off?


    2. What is the gap between the clutch faces?


    3. Just because something has voltage does not mean that it has the ability to carry the amps.


    Here are some of the troubleshooting steps I would take. First I would check the clutch coil for continuity. Then I would check it for operation. engine off key on I would run a line from the battery to the clutch coil. just tap the two connections together and the clutch should engage. If it doesnt then doublecheck that the engine has a good ground clear to the clutch and try it again. if it still doesnt work then the clutch coil is bad.


    If the clutch tests good then it is time to test switches and relays to the clutch to make sure neither have gotten so burned that they cant carry the current required. It takes quite a bit of electricity to keep that clutch engaged.




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