96 850 T AC clutch

Discussion in 'Volvo 850' started by John Yahn, Jul 1, 2007.

  1. John Yahn

    John Yahn Guest

    My AC works great as long as the outside temp. is below 85° F and I'm not
    stuck in traffic then it blows warm air and usually will not resume cooling.
    I bypassed the high temp switch but the problem continues. I was told that
    the clutch was worn and the entire compressor had to be replaced?? Can the
    clutch be repaired or replaced? The car has 260000 miles.
    John Yahn, Jul 1, 2007
  2. John Yahn

    Alessio Guest

    Sorry for my English, but i'm italian.
    You must adjust the distance of the clutch. I don't know what is the correct
    gap but I'm sure that is the solution. Ask at your dealer for this.
    Alessio, Jul 1, 2007
  3. John Yahn

    Baz Guest


    Hi John,

    I had a similar problem about 18months ago on my '96 850. It turned out to
    be a "temperature sensitive" pressostat switch. That's the pressure switch
    on the firewall that controls the compressor on/off cycling.

    When it got hot it would fail to turn the compressor on. Generally, if the
    a/c was turned on while the car was cold, say first thing in the morning, it
    would work ok even in 40deg C outside temp. The cold return gas from the
    evaporator kept it cool. But if stuck in traffic or the engine turned off
    for even a few minutes, the exhaust manifold would heat it to where it would
    fail to operate.

    You can check for this by pulling off the pressostat plug and putting a
    short circuit across the two pins in the plug (with the motor running),
    while your a/c is not working properly. The compressor should run and the
    a/c work.

    The pressostat can be replaced without de-gassing the a/c. It has a
    "schrader" type valve under it. Mine was really tight though. It also cost
    about AUD120 (from Volvo).

    My high temp switch also failed a couple of weeks later, so I bypassed it
    and things are still ok after 18 months.

    Baz, Jul 2, 2007
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