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11-09-2020, 09:57 PM
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#1 |
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Registered User
Join Date: Sep 2018
Location: Sacramento,CA
Posts: 85
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Heater not working on high
For some reason my heater blower works great on low med and then when you put it on high it shuts off. Like I've lost all power to it. Any thoughts? It's a 70 factory ac cab with every thing still in it.
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70 custom10 swb fleet side 454 th400 |
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11-09-2020, 10:27 PM
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#2 |
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Senior Member
 
Join Date: Dec 2009
Location: TN.
Posts: 7,724
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Re: Heater not working on high
Here is and old Thread that covers most of the issues.
Hope this helps  Link:https://67-72chevytrucks.com/vboard/...e+hi+speed+fan .
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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11-10-2020, 08:49 AM
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#3 |
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Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,130
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Re: Heater not working on high
The high speed is powered by a separate wire that feeds a relay behind and to the right of the glove box. You may not be getting feed power to the relay, OR the speed switch is bad, OR the relay is not working (OR any combo thereof). The plastic connector at the back of the speed switch is known for getting extra hot and melting down, but this usually causes fuse issues.
There's a wiring diagram in this thread that shows what I am talking about... https://67-72chevytrucks.com/vboard/...d.php?t=807883
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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