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Procedure for testing failed ac system? V70-XC70 2000

posted by  mahnrut on  Tue Aug 5 13:39 CST 2008
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last visit: Sun Apr 26 12:39 CST 2009
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Our air conditioning stopped cooling a month or so ago. We took it to a local shop and they said the freon was OK and we paid them $50 to investigate further. They said that they thought it was the compressor. My husband asked if they were sure and they said that you can never be sure (implying it was by default). We did not do the repair but are now thinking of it. We did not get anything in writing which was stupid of us but we will go back and ask exactly what they looked at - it is a decent shop but I think there should have been more on the paper than the labor cost to check it out. It would be useful to know what they should have tested. Thanks for any help.








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    Procedure for testing failed ac system? V70-XC70 2000

    posted by  KlausC on  Tue Aug 5 17:35 CST 2008
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    last visit: Fri Oct 24 10:15 CST 2014
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    Testing compressor clutch:

    Turn engine on, turn the temp dials to coldest setting. Open hood.
    With a 3 ft long wood dowl, broom stick handle, or like, lightly tap the non moving compressor clutch. It should engage. Be very careful of the serpentine belt touching the stick, it will grab it out of your hands and that can hurt.

    If that starts the compressor, then the clutch needs to be re-shimmed.

    If that still didn't do it, there is a pressostat switch on the freon line coming out of the firewall. Unplug it and using a short wire, insert it into the + and - terminals of the plug that is in your hand. If the compressor then starts, you need a new pressostat or more R134a added to the system. But they checked the pressure and it was OK?

    There is also an AC relay, but I dont know how to verify if it goes bad.

    If the compressor died, it should be making terrible noises...

    Klaus
    --
    I still miss my 164 and my 854T. Just driving a V70R :)








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    Procedure for testing failed ac system? V70-XC70 2000

    posted by  Deanyel on  Tue Aug 5 14:25 CST 2008
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    last visit: Sun Sep 21 12:02 CST 2008
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    Is the compressor clutch engaging? In other words when you turn the AC on does the compressor start to turn? The outer pulley with the belt turns all the time but when you turn the AC on the compressor should start to turn too when the clutch engages. This simple test is a good place to start.







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