What causes the heater fan to stop working on high?

Asked by Jan 02, 2014 at 05:58 PM about the 2000 Chevrolet S-10 2 Dr STD Standard Cab LB

Question type: Maintenance & Repair

Started the truck up one cold snowy morning and came back inside after making sure the temperature was on high, the blower was set to high and blowing to defrost the windshield.  Came out 5 minutes later and nothing.  No fan, and very little heat of course.
Went where I had to go anyway and on the way back, about 10 minutes of driving and the blower started working on medium setting.  Checked low setting and worked fine, but not high.
I cannot find a blown fuse.  Had the same problem with a '94 Silhoutte and it turned out to be some kind of module or relay or something on the firewall.

1 Answer

70,295

Could be the resistor block is bad. HTH. -Jim

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