Question about 1996 Volvo 850

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Heater blower won't run on heat or a/c

Checked fuses,have voltage thru resister,blower bench tests ok. Fan switch activates a/c compressor. Temp controls seam to work ok.

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  • wdbennett2 Apr 13, 2009

    The problem was the climate control module.

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Sounds like blower motor is junk what hapens is people take the cabin filther out and all kinds of junk falls into heater motor and eventually it gets stuck and motor will not work right

Posted on Apr 12, 2009

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No heat 1995 cutlass ciera


Ok quick fix........
This is a common GM problem. The heater will stop operating when the plastic vacume line is broken under the hood. It is an 1/8 inch black plastic vacume line running fron the intake manifold to a vacume check valve under the hood to the heater/AC assy located to the passenger side. You may also want to check the fuses under the dash to the blower motor. If the fuse is good take a Digital multi meter and check for voltage at the motor. If there is no voltage check the reistat in the blower hosing. It is a small rectangle plastic piece on the blower housing with two small screws. Check for voltage at the input and output side. If there is voltage check for resistance at the motor by unpluging the blower motor and probing the terminals to the motor. Tap the motor and see what type of fluctuation you get. Lastly if all that checks out and you have no voltage to the motor or reistat check the switch input and all three fan speed outputs. It could be a simple switch issue.
Good luck and let me know if you need further guidence.

Philip

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