Blower motor only runs on HI...

[K10NM]

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!!!!!

[rs74]

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

[K10NM]

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

[Irish_Alley]

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

[Skunksmash]

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

[TxFiddler]

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.

[Skunksmash]

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

[Irish_Alley]

Read the post I posted

[mrboyy17]

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

[K10NM]

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!!!