2002 Buick century ac/heater control replacement

Asked by Mar 03, 2016 at 10:56 PM about the 2002 Buick Century Limited

Question type: Maintenance & Repair

I have a 2002 Buick century and the vent fan won't blow anymore. I have
replaced the resistor, and the vent fan itself and it hasn't solved the issue. My
next step is to replace the control unit. I'm really not sure where to start to get
at it. Any advice would be helpful!!!!

1 Answer

855

I answered a similar question about a year ago, and added that answer below: It could be that you have a bad blower speed switch (on panel below radio), or a bad blower motor. Remove the speed switch from the dash (leave wiring harness on) and while the ignition key is in the "on" position, test (with a multi-meter set on DC) for 12V voltage at the blue, yellow, and tan wire connections. If no voltage is detected, then check for continuity between the brown wire in the wiring harness and each of the other wire terminal connections on the back of the switch, as the switch is run through its speed selections. If still no voltage, the switch is your culprit, otherwise switch your focus to the blower motor. If the blower motor is found to be defective, it should be replaced as a set with the blower motor resistor.

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