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850 air conditioning drops out 850

posted by  Svenski on  Sun Jun 3 14:55 CST 2007
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last visit: Tue Dec 31 16:10 CST 2013
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Greetings: Our '96 850 a/c initially seems to work fine. Blows cold air, the aux. fan works. But at some point, the compressor drops out ( clutch disengaged), loose a/c air and it will not come back. It seems the hotter it is outside , the sooner it will quit. It will eventually return, but only after sitting for a prolonged period but then cut out again. My understanding is that this system is an orafice pressure reduction system with an accumulator correct? I was almost hoping the problem is an undercharge but after afixing a charging bottle with provided guage, it showed good charge.(25-33 lbs.)Should I vent off some charge anyway? Any suggestions ? Thanks








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    850 air conditioning drops out 850

    posted by  someone claiming to be RUIAMARO on  Wed Jun 6 07:25 CST 2007 [RELATED]

    Had exactly the same problem, but on my case there's a whining noise when the compressor is engaged, i think it has to do with the bearings being way too worn.

    Regards

    Rui Amaro
    94 855 T5 300000++ Km








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    850 air conditioning drops out 850

    posted by  Icelandic on  Mon Jun 4 06:09 CST 2007
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    last visit: Tue May 8 06:35 CST 2012
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    This is a typical sign of a too large AC compressor clutch gap. Due to wear, the gap increases and as the electric field that makes it engage gets weaker because of heat, the clutch will disengage and will only engage again after the compressor and clutch temperature comes down. The fix is to remove one or two of the shims behind the clutch pulley. It is a one to two hour job when done by an AC shop.
    No need to discharge the system, but the AC compressor will have to be released from its mountings on the subframe, so that the screw on the center of the clutch can be removed.

    Good Luck








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      svenski 850

      posted by  someone claiming to be svenski on  Mon Jun 4 15:03 CST 2007 [RELATED]

      Thanks Icelandic for your direction. It snapped in with a tap.
      So long Bob 740T 850T









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        svenski 850

        posted by  HB on  Mon Jun 4 22:36 CST 2007
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        last visit: Sat Aug 27 05:01 CST 2011
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        I had the same problem. The other factor is that not enough power is getting to the clutch. Check the voltage at the clutch wire when it is running. I ran a wire into the car and was able to watch the volt meter as I drove around. The clutch was getting only 11 volts when it would start to get warm. I added a relay and gave the clutch full battery voltage. Properly fused. It ran all last summer and is still working fine now. If you need details let me know.

        --
        Howard Berman 95 850 wagon 162K, 2000 S80T6 72K, 94 850 Sedan 140K, 68 1800S 80K(My Toy)








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          svenski 850 1997

          posted by  Svenski on  Tue Jun 5 13:28 CST 2007
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          last visit: Tue Dec 31 16:10 CST 2013
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          Interesting HB . What did you use for a relay, something like a horn relay over counter? Where did you tap in for your bat. voltage ? Thanks








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            svenski 850 1997

            posted by  HB on  Tue Jun 5 22:49 CST 2007
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            last visit: Sat Aug 27 05:01 CST 2011
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            I used a "standard" 40 amp relay. The type you use for fog lamps. I got battery voltage at the battery. I used an inline fuse on the way to the relay to cover myself.

            Any other questions????
            --
            Howard Berman 95 850 wagon 162K, 2000 S80T6 72K, 94 850 Sedan 140K, 68 1800S 80K(My Toy)







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