1995 Volvo 850 - Loud A/C noise.

Discussion in 'Volvo 850' started by Jerry Phillips, Oct 8, 2005.

  1. I recently bought a 1995 850 GLT. When I turn on the A/C, I think the
    compressor is making too much noise. Should it be fairly loud or is this a
    bad sign? The A/C also stops cooling from time to time, especially in hot
    temperatures. I recall reading about a switch that often appears to
    over-heat and there by turning off the A/C. This seems like my problem.
    Any thoughts?
    Thanks
    Jerry
     
    Jerry Phillips, Oct 8, 2005
    #1
  2. Jerry Phillips

    James Sweet Guest

    Sounds like the charge is low, the compressor may also be failing, it should
    be almost silent.
     
    James Sweet, Oct 8, 2005
    #2
  3. Jerry Phillips

    Ron Guest

    AC compressors can become rather noisy as they become older. While any
    noise is not a good thing I have seen compressors run for months even years
    with slight buzzing noises. Knocking or grinding noises are a different
    story, they should be attended to in short order.
    When your AC stops cooling check to see if the compressor clutch is
    engaged. If it is, it may only be a refrigerant issue. If the clutch is not
    engaged CAREFULLY unplug the wire from the clutch and probe the harness side
    of the connector with a test light.If the light lights, you more than likely
    have a bad compressor clutch. If the light does not light the problem is
    electrical.
    The over heat switch you are referring to was not used on all models,
    however, it is easy enough to locate and test. If you follow the harness
    terminal you just checked with the test light, it will either go directly
    into the wiring harness or around the back side of the compressor and into a
    little round screw-in plug. Another wire will come out of this plug and into
    the wiring harness. That screw-in plug is the over heat switch. You can
    bypass the switch by simply rerouting the harness wire over to the wire
    coming off the compressor clutch.
     
    Ron, Oct 8, 2005
    #3
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