Pontiac Problems? Ask a Mechanic for Answers ASAP
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.
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.