1997 GMC Jimmy 1997 Jimmy Fan Blower starts by itself when

1997 GMC JIMMY
200,000 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
FIVE25TWO
  • MEMBER
  • 1 POST
We have heard the blower running in our carport many times. I had always thought it was somehow tied into some type of humidity sensor, to clear the windshield, but it runs so long, it has from time to time drained the battery. I have spoken to the dealer, he said it may be a short (i dont think so) and no help there, I have resorted to pulling the fuse for the heater blower at night, and this prevents it from happening.
Incidently, when I start driving, and the vehicles gets to temperature, I hear a metalic "pop" under the dash, and I recognise this noise as a bi metalic thermostat used in other applications.
Not sure where to start searching. because this happens about an hour after parking, and for a short time, it is hard to diagnose. Suggestions?
Apr 21, 2008 at 11:22 PM
Advertisement
Avatar
STRAILER
  • ASE Certified Mechanic
  • 54,861 POSTS
  • ASE Certified Mechanic
Hi, it sounds like you have a short because that circuit goes dead when the key is removed. But if you have "automatic" climate controlled, replace the fan speed controller. please let me know
Apr 22, 2008 at 1:36 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
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.