Intermittent heater fan not working

Tiny
LISROB
  • MEMBER
  • 2012 GMC SIERRA
  • V6
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
The fan for the heat works one day and not the next. I have replaced the resistor about a month ago.
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Monday, January 13th, 2020 AT 3:47 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

You will need to do some voltage tests to determine the issue.

https://www.2carpros.com/articles/how-to-check-wiring

You need to check for voltage to the resistor with the key on. It could be either the resistor or the blower motor.

Roy

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Monday, January 13th, 2020 AT 4:45 PM

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