HVAC Woes - Ford Mustang Forum
 
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post #1 of 4 (permalink) Old 01-15-2015 Thread Starter
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HVAC Woes

Yesterday I replaced a blower motor resistor and everything was back to normal. Today I hop in the car to go to work and the fan only works on high again. I'm not sure what could have caused me to blow another blower motor resistor.

Does anyone know what possible causes there may be for this one burning out so quick? Maybe just a defective part?

I have a warranty through advanced auto and will try to get a replacement by tomorrow. I just don't want to burn another one up.

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post #2 of 4 (permalink) Old 01-15-2015
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I am not an authority on your car, but I do know a little about electricity. Try and test the resistances in the blower motor. Maybe its trying to draw too much voltage/amps through the resistor. Just my wild guess. Good luck!


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post #3 of 4 (permalink) Old 01-15-2015 Thread Starter
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I only know a little bit about electricity but here are my opinions.

Correct me if I'm wrong but if designed right the fuse for my blower motor should blow before the current gets too high for the resistor?

Voltage spikes shouldn't be possible as to my knowledge as there would be a maximum of 12 volts going through the resistor.

Maybe I'm way off. This whole thing is puzzling.
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post #4 of 4 (permalink) Old 01-19-2015 Thread Starter
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Update: I replaced my cabin air filter because I heard a clogged filter could put more strain on the motor and make it draw more amps.

That didn't fix the issue and it burned another resistor.

I think my next course of action will be to replace the motor and the harness plug both. The harness all looked ok and not melted or anything but the plug had some kind of hard gooey substance in it not sure if that could be the issue or if that was some kind of adhesive used in the coupler.
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