heater fan

1995 CHEVROLET ASTRO
150,000 MILES • 6 CYL • 2WD • AUTOMATIC
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DOUGM
  • MEMBER
  • 1 POST
heater fan works one day and not the next. it is a plain jane model 2 wheel dr auto v6 with ac
Jan 31, 2011 at 6:43 PM
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JDL
  • CAR REPAIR CONTRIBUTOR
  • 16,098 POSTS
I'd have to check the wiring at the blower motor, when the problem is ongoing. Take connector loose from blower motor, key on, hvac on, use a voltage tester and check for voltage and ground at the wiring harness connector. Orange wire is voltage, black is ground. I've seen faulty blower motors that would work intermittently. sometimes you can tap on it and it starts working. Wiring info below.
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Jan 31, 2011 at 6:53 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.