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960 A/C blows warm at highway speeds 900 1996

posted by  Tech Analysis on  Fri Jan 10 15:45 CST 2003
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My 1996 960 Air Conditoner runs fine when in the city. Once we hit about 40-45MPH the compressor cuts off. Air still blows from the dash vents OK just no cooling.

Can this be vacuum related, since the AC compressor is an electrical clutch, or is it controlled by a vacuum servo somewhere?

Thanks to anyone who can help.







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    960 A/C blows warm at highway speeds 900 1996

    posted by  Azeez on  Tue Jan 14 07:18 CST 2003
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    We had the same problem on our 960 with teh AC compressor cutting out on the highway. Stop & go traffic it would work fine. Turned out to be low refrigerant; recharge took care of it, and have not had any problems since.

    96 960 102,000 miles.








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    960 A/C blows warm at highway speeds 900 1996

    posted by  Iroll on  Fri Jan 10 16:44 CST 2003
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    Are you sure the compressor is shutting off? It is possible that there is a vacuum leak in the ECC control system (vacuum line to the coolant valve?) such that at higher throttle settings (resulting in lower manifold vacuum) the coolant valve goes to the warm position (no vacuum default).

    The coolant valve on the engine side of the firewall is controlled by the grey hose form the solenoid bank above the passenger's left foot (LHD cars at least). I have a diagram that migst help. Get in touch.
    --
    '61 122s B16, '67 122s B18, '76 245 B21F, '81 245 B23E, '90 745 B234, '95 960 B6304 (not counting parts cars)








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      960 A/C blows warm at highway speeds 900 1996

      posted by  B.C. on  Fri Jan 10 17:07 CST 2003
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      last visit: Wed Mar 28 22:28 CST 2012
      [RELATED]

      Maybe there's a simple test. At highway speed, when the air is blowing warm, slip into neutral and let the engine speed drop. This will raise manifold vacuum - and if the ECC vacuum is the problem, the air temp should change.

      If the refrigerant is low, there may be icing in the evaporator which could cause the problem. Try setting the system to just barely cool.

      Good Luck,

      Bob

      :>)







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