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AC Problem Fixed ....Almost 850

posted by  4strokejoke on  Mon Jun 1 08:56 CST 2009
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last visit: Mon Apr 25 18:36 CST 2011
[RELATED]

I finally got my AC working, but had to kind of ghetto rig it, please let me know your thoughts.

Original problem:

- No AC, clutch wasn't engaging. Tried jumping high and low pressure sensors and hooking compressor directly to the battery. No pressure in system. (96' 850 wagon, 5 speed). Just blew hot air.

Solution:

-Shimmed clutch w/ a cut up credit card and super glue (took about 5 minutes and didn't even need to jack up car)

-Completely cut out temperature sensor in compressor.

-Left high pressure sensor disconnected.

-Filled w/ refrigerant. When system is running, pressure is around 25, when system is stopped, pressure reads around 70.

- AC switch in cabin works to turn compressor on/off

Question:

My temperature sensor in the compressor is obviously faulty, but why do I need to leave the high pressure sensor disconnected. Are the pressures that I am observing normal? Or should it always read in the 25ish psi range no matter if the compressor is on or off?







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    AC Problem Fixed ....Almost 850

    posted by  KlausC on  Mon Jun 1 13:52 CST 2009
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    The temp switch fails a lot on the 850s, leave it off. The high pressure switch is supposed to save the compresor in case the pressure gets too high. You system also has a mechanical blow off valve, which will make a terrible sound when it happens and leave you wondering what happened!! :) I found out that the high pressure switch also didn't work in my car, along with the temp switch.
    I over filled by an extra 1/2 can on a 55F day. Two days later, it was 80F in the parking lot and the compressor was rattling something fierce. The gas expands a lot in heat, and BANG! NO harm. The AC still worked fine and the compressor stopped making noise.

    Klaus
    --
    Common sense trumps a PhD







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