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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: bigfosty on March 31, 2011, 06:42:31 am

Title: heater/blower motor
Post by: bigfosty on March 31, 2011, 06:42:31 am

Okay guys, did a search and got a few ideas on what might be wrong, but I'm willing to listen to all ideas. When I first got my truck the heater would only blow on three quarter speed, then all of a sudden it quit. I put power to the motor directly from  the battery and it turns on so the motor is good, I replaced the relay, I checked the fuses but don't know which one is for the blower they all looked good but if you can tell me which one is for the heater I will check again, I pulled the resistor and it looked fine but I havene't tried a new one yet, and I put a different switch in (the actual switch on the dash you change the fan speed with) but it was out of a junkyard truck so it could be that. Anything alse I need to check? Anybody run into this before? Thanks for any help, I really miss driving my truck, it's just too dang cold without a heater.

P.S.- It's a 75 K-10

Title: Re: heater/blower motor
Post by: bake74 on March 31, 2011, 08:42:23 am

     I'm not sure about your case, but my switch was causing my problem, it would only blow on high and nothing else until I changed switches.  Hope this helps.

Title: Re: heater/blower motor
Post by: Captkaos on March 31, 2011, 01:01:56 pm

sounds like the switch to me.

Title: Re: heater/blower motor
Post by: 1980c10 on March 31, 2011, 06:48:30 pm

had been a switch on mine also, I replaced the entire control though

Title: Re: heater/blower motor
Post by: RonS on April 06, 2011, 10:19:33 am

I bet it is the resistor.