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How do you troubleshoot 1991Buick Roadmaster blower motor problem?
Wiki User
∙ 15y ago
First find blower moter unplug wireing harness vse voltmeter to test supply end of wireing harnes for voltage if there is voltage replace motor (make sure your fan is turned on when doing this) if no power go to your local library and find the wireing diagram for the HVAC start at blower moter and follow it back to power source this will tell you what componets E.G. relays and other switches. are in line test each one tell you find the culprit. On my 96 the blower motor is under the dashbehind the glove box
Wiki User
∙ 15y ago
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