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Derek Werner
Derek Werner, Pontiac Technician
Category: Pontiac
Satisfied Customers: 135
Experience:  ASE Master Technician, L1 Advanced Level Specialist
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Bower motor not working

Customer Question

Bower motor not working
Submitted: 1 year ago.
Category: Pontiac
Expert:  Derek Werner replied 1 year ago.

Hello and welcome,

The most common cause is a failed blower motor resistor. The blower motor will draw to many amps as it ages, causing the resistor to fail. The resistor and the fan should be replaced together.

There is a 30 amp fuse for the blower motor that should be checked.

Are you going to attempt to diagnose the problem your self? You will need a test light or multimeter.

Thanks

William

Customer: replied 1 year ago.
Have already replace resistor and control panel. I tested fan and fan works when I put power to it
Expert:  Derek Werner replied 1 year ago.

ok no problem, the fan should also be replaced even though it is working. Should pull less than 16amps at full speed.

Is this a manual or automatic climate control?

At the module you will need to test for power and ground i would recommend testing with a test lamp.

1. At the module test for battery voltage on the red wire.

2. next check for ground at the black wire.

3. Purple wire should have battery voltage this is the power feed for the blower fan.

4. Gray/Black 5 volts that drops as higher fan speed is requested and the Black wire at pin D is the ground for the blower motor that is pulse-width modulated. You will need a multimeter to test for this.