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Author Topic: Blower motor only runs on HI...  (Read 7915 times)

Offline K10NM

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Blower motor only runs on HI...
« 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!!!!!
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85 Chevy K10
9" of total lift, 6 susp., 3 body
35x12.50x15 BFG all terrains
Shaved handles, tailgate, mirrors
Custom interior

Offline rs74

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Re: Blower motor only runs on HI...
« Reply #1 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.
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Offline K10NM

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Re: Blower motor only runs on HI...
« Reply #2 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!!
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85 Chevy K10
9" of total lift, 6 susp., 3 body
35x12.50x15 BFG all terrains
Shaved handles, tailgate, mirrors
Custom interior

Offline Irish_Alley

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Re: Blower motor only runs on HI...
« Reply #3 on: July 03, 2010, 11:47:26 pm »
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline Skunksmash

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Re: Blower motor only runs on HI...
« Reply #4 on: July 04, 2010, 02:02:59 pm »
Ha, my blower motor will only run on every setting except high. Kinda sucks.
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Offline TxFiddler

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Re: Blower motor only runs on HI...
« Reply #5 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.
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80 C10 2wd / 427 BigBlock / 700R4 / 3:42 Eaton Posi LSD / 770 cfm Holley Street Avenger / Doug's Headers / MSD ProBillet Distributor / Champion 3 row Radiator

Offline Skunksmash

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Re: Blower motor only runs on HI...
« Reply #6 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?
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Offline Irish_Alley

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  • Family is not an important thing. It's everything.
Re: Blower motor only runs on HI...
« Reply #7 on: July 05, 2010, 06:27:25 pm »
Read the post I posted ???
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline mrboyy17

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Re: Blower motor only runs on HI...
« Reply #8 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
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Offline K10NM

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  • Posts: 7
Re: Blower motor only runs on HI...
« Reply #9 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!!!
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85 Chevy K10
9" of total lift, 6 susp., 3 body
35x12.50x15 BFG all terrains
Shaved handles, tailgate, mirrors
Custom interior
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