2003 Chevy Trailblazer Blower motor Voltage check

Tiny
MRHAPPY
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
Electrical problem
2003 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic

I checked the voltage at the fan motor plug with the plug disconnected, and got voltage present at both terminals. Does that tell me the fan motor is faulty? Should I check anything else to confirm this theory?
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Thursday, October 28th, 2010 AT 10:22 PM

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Tiny
FACTORYJACK
  • EXPERT
If this is an automatic climate system, and you had voltage at both the purple wire(a) and black wire(b) then I would suggest you have a faulty blower speed processor. If it is a manual climate system, pin B should be hard wired to ground, but is junctioned within the blower resistor, so if you had volts on both I would suspect a resistor. I would assume the method you used, was either a voltmeter with one lead to ground and the other probing each wire and got voltage. Or you used a test light to ground and got a light from both circuits.
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Thursday, October 28th, 2010 AT 11:00 PM
Tiny
MRHAPPY
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This is an automatic control system and I used a meter with one terminal to ground. Thankyou for the info.
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Friday, October 29th, 2010 AT 12:50 PM

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