Question about 2001 Pontiac Aztek
Resistor for that speed or switch is defective
FYI usually high speed on blower bypasses resistors and gets direct B+.
Posted on May 28, 2010
The blower motor and controller module (resistor) are mounted under the passenger side of dash. Remove the plastic cover from the bottom of the dash. The Control module is to the left and back a little. Locate the wiring harness feeding it. You may test the wiring for power with a test light or voltmeter as follows, the red wire in the big connector to the blower controller should have +12 volts on it at all times. If not check the fuse / relay. Then unhook, the smaller two wire connector to the blower motor. Test it for battery voltage across the connector, if you have battery voltage on all speed settings, then your blower motor is bad. If you do not have voltage on all speeds, the blower resistor is bad. Usually the high side or the lower speeds will quit. It is not uncommon for the entire controller to go out either.
To replace the module disconnect the wiring harness connection on the controller from the connector on the wiring harness. Press the locking tab as you separate the two halves of the connection. Use care to not damage the connector from the wiring harness and inspect it for damaged, melted, burnt or frayed wires. Remove the two retaining bolts on the bottom edge of the controller with a nut driver or a socket and ratchet. Pull the controller off the housing and remove it from under the dash. Install the new module with the same screws. Plug the wiring back in and test it.
Posted on Dec 12, 2014
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Posted on Jan 02, 2017
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