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DIY: Do It Yourself
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Old 07-20-2011, 05:35 PM   #1
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Join Date: Jan 2006
Location: Belle Plaine, MN
Posts: 130
My Ride: 01 325 CI
Troubleshooting: Final stage resistor or blower motor

The blower motor isn't working. I have the rheostat style HVAC controls and have tested the blower motor on all 4 speeds, with and without the AC and with recirculate.

I know the FSR is a common issue, but I'm not one to throw parts at a car unless I know I have isolated the broken part. My logic, check to see if the blower motor has power, if it does we know a fuse isn't bad and (I would assume) the FSR is working. I don't have a load tester but am assuming speed is regulated through amperage. This isn't defined in the Bentley manual.

When the car is off, zero voltage (as expected) is at the blower motor. When the car is on and the fan is set to any speed I get 12v on each pole of the electric motor (confusing). Leave the car on with the fan turned off, I still get 12 volts (even more confusing).

Short of unhooking the motor and connecting a 12 volt source to see if it spins, how would I continue to verify that it is the blower motor and not the FSR? Or is there another way to isolate the FSR/blower motor that I haven't found yet on the forum?

Last edited by Spyder_Venom; 07-20-2011 at 05:36 PM.
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