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How do I know it's my blower motor itself, blower motor resistor or a switchbox?
You view wiring diagrams an test electrical circuits with a DVOM - digital volt ohm meter .
Free wiring diagrams here http://www.bbbind.com/free-tsb
Enter vehicle info. year , make , model an engine size , Under system click on HVAC , under subsystem HVAC controls . Click the search button ,then the blue link.
Do you know how to do that ? Videos on youtube on electrical circuit testing .
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