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Old 09-21-2020, 11:51 PM   #1
hessam69
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Join Date: Jun 2009
Location: Sydney, Australia
Default Heater fan speed problem

Hi,

I have a 1992 940GL with manual MCC air conditioning.

The fan only works on speeds 3, 4 and 5. Not on 1 and 2. I swapped the control unit with one from another 940, and it doesn't solve the issue. Is there a fan speed resistor and if so where is it located also can it be repaired? Is that my problem?

Thank you
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Old 09-22-2020, 12:23 AM   #2
iamrolling
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Join Date: Nov 2019
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Resistor is behind the glove box. I don't know if it can be fixed, but it looks like it uses real resistors instead of graphite traces. Pull it before buying a new one, because it looks like there are two different types of resistor for the 940. One looks like ceramic resistors in a heat shrink tube, and the other is a neat looking box with a big heat sink on one side. The first one runs a little under $100, and the other is about $200.
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1993 940 Turbo (Mostly stock)

WARNING: I am not a professional mechanic, and you should only base your repair decisions on my advice if I'm not corrected by someone who has worked on more than a few Volvos.

Last edited by iamrolling; 09-22-2020 at 12:29 AM..
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Old 09-23-2020, 05:11 PM   #3
hessam69
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Thank you very much, this helped. My problem was also the fan speed resistor, I changed it, now my fan works and my non-functioning AC works too. There must be a load sensor for protection.

Thanks again
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Old 09-23-2020, 09:57 PM   #4
iamrolling
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Good to hear.
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