Question about 1996 Volvo 850

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On 1996 Volvo 850, the Air Conditioning does not work for settings 1-3, but comes on full blast at 4. Thought it was a fuse issue but replacing the fuse did nothing. Any ideas?

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This symptom is caused by a burned out blower motor resistor -- it needs replacing.

Posted on Jul 19, 2009

  • Samuel Charles Spriggs Jul 20, 2009

    The bad component is not the blower switch -- it's the blower motor resistor.



    The 4 speeds of a blower motor are achieved by running the circuits for speeds 1,2 & 3 thru a resistor with three different values. The 4th speed (high) bypasses the resistor -- it gets the full 12 volts. That's why the blower will not run on speeds 1,2,3 but will run on the 4th speed.

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Replace the selector switch... 1-3 is busted....

Posted on Jul 19, 2009

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Try cleaning the throttle body and air idle control valve (IAC). The computer kicks the idle up when the a/c is on, if your throttle body or AIC valve is full of crud it will idle very low and feel rough.

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