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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: K10NM on July 03, 2010, 06:00:27 pm

Title: Blower motor only runs on HI...
Post by: K10NM on July 03, 2010, 06:00:27 pm

I'm working on the interior of my 85 K10, and am having trouble with my heater/ac blower. The motor will only run on 'HI'. Where should I start looking to fix this problem? Thanks for any and all help!!!!!

Title: Re: Blower motor only runs on HI...
Post by: rs74 on July 03, 2010, 10:50:38 pm

Sound like it could be the blower motor resistor. Usually when they only work on high it is the resistor.

Title: Re: Blower motor only runs on HI...
Post by: K10NM on July 03, 2010, 11:23:51 pm

Thanks for the reply!! I'll try to replace that as soon as I can, and let you know how it goes!!

Title: Re: Blower motor only runs on HI...
Post by: Irish_Alley on July 03, 2010, 11:47:26 pm

http://forum.73-87chevytrucks.com/smforum/index.php?topic=16395.0

Title: Re: Blower motor only runs on HI...
Post by: Skunksmash on July 04, 2010, 02:02:59 pm

Ha, my blower motor will only run on every setting except high. Kinda sucks.

Title: Re: Blower motor only runs on HI...
Post by: TxFiddler on July 05, 2010, 04:01:31 pm

I had the same problem, however, I did not need a new resistor.  The wiring on the plug that goes to the resistor had become loose.  Check the wires in the connector before you buy a new resistor.

Title: Re: Blower motor only runs on HI...
Post by: Skunksmash on July 05, 2010, 06:18:13 pm

What resistor are you guys talking about? Anyone happen to have a pic of its location, or what it looks like?

Title: Re: Blower motor only runs on HI...
Post by: Irish_Alley on July 05, 2010, 06:27:25 pm

Read the post I posted ???

Title: Re: Blower motor only runs on HI...
Post by: mrboyy17 on July 06, 2010, 12:14:28 pm

when i bought my truck i had the same problem.  however mine was fixed by changing the relay....not the resistor.  i bought a new resister too but never put it on cuz the relay fixed the problem.
mark

Title: Re: Blower motor only runs on HI...
Post by: K10NM on August 12, 2010, 04:27:54 pm

Just wanted to say thanks to all for your help! I was finally able to get around to fixing the blower problem. It was the relay that was bad. Thanks again, I now have a normal working blower fan!!!