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A new problem on my s90 S90-V90

posted by  toms90 on  Mon Nov 9 05:31 CST 2009
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last visit: Fri Aug 24 21:21 CST 2012
[RELATED]

When I turn the knob to the defrost, the AC is on, eventhough the temp. is set at max heat. Is that normal or something is wrong?
Tom








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    A new problem on my s90 S90-V90

    posted by  toms90 on  Sat Nov 14 20:44 CST 2009
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    last visit: Fri Aug 24 21:21 CST 2012
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    Thanks all and good to know it is normal. So it is useless if I am driving in freezing rain?








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      A new problem on my s90 S90-V90

      posted by  david hunter on  Sun Nov 15 17:09 CST 2009
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      last visit: Mon Jun 30 22:10 CST 2014
      [RELATED]

      It's actually very effective in rain, snow, sleet etc. The air coming out the defrost will be quite hot even though the AC is on and will easily prevent the build up of ice etc on the outside and remove any condensation on the inside. Any cars I have driven all do the same thing.
      --
      David Hunter








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    A new problem on my s90 S90-V90

    posted by  Volvodad on  Mon Nov 9 19:35 CST 2009
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    last visit: Thu Oct 23 16:18 CST 2014
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    Agree, normal.

    I inherited a 69 Cadillac in the early 70's and got the GM manual for it so I could DIY. It described how the A/C compressor would always operate with the climate control in the Defrost position. Reason as Dewfpo stated: dehumidify incoming air for quicker window demisting/defrosting. So it's been standard procedure - on some cars anyway - for a long time.
    --
    Bob (son's 81-244GL B21F-M46, dtr's 94-940 B230FD, my 83-244DL B23F-M46, 89-745(LT1 V8), 98-S90, 77MGB and four old motorcycles)








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    A new problem on my s90 S90-V90

    uid 11021's pic
    posted by  dewfpo on  Mon Nov 9 14:30 CST 2009
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    last visit: Thu Oct 23 18:34 CST 2014
    [RELATED]

    No new problem, normal. The A/C dries the air out regardless of temp setting. Help with defrosting.

    DEWFPO
    --
    1998 S90 083,228 and 1995 964 154,100







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