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Initial start(usually cold) heater motor slows and revs S70

posted by  fabickfo on  Thu Feb 12 02:38 CST 2009
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last visit: Sat Oct 23 04:05 CST 2010
[RELATED]

98' S70 GLT 160k
Lately I have been hearing my heater motor, or I should say fan when the car is cold, cycle up and down, sounding like either a lack of power or something slipping.

The sound can be described that it is normal then sounds to slow, output is reduced. After a few minutes or if I am quick onto a road that I open it up, it apparently goes away. More noticable when parked or at a light.

I dont see any codes, yet I am curious if anyone has any suggestions, the issue is not a big one, yet curious if something is going down hill, or I should be concerned.

Thanks Fred








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    Initial start(usually cold) heater motor slows and revs S70

    posted by  KlausC on  Thu Feb 12 04:51 CST 2009
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    Blower is a better word than fan, which is confused by some as the engine fan.

    On initial startup, the ECC will test the blower by running it on high for a few seconds. If this does not happen, the recirc and ac switches will blink 20 times. The codes for ECC program failures can only be retrieved with a Volvo specific scanner, which means dealer or very good Volvo independent.

    Once your car warms up, try running the blower on high speed for about 5 minutes. This should either help the bearings slop around any left over grease or help the blower die an early death if the bearings are in their final stage of life. It will let you know by screaming at you :)

    If the fan is still quiet, it might be the power stage which regulates voltage to the blower. Not a cheap part, it does fail on not so rare occasions. I wouldn't replace either one until one or the other fails completely.
    --
    My name is Klaus and I am a Volvoholic.







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