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09-13-2015, 08:44 AM
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#1 |
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Registered User
Join Date: Jun 2014
Location: Bllomfield Iowa
Posts: 49
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Heater fan motor?
I have a 72 with factory A/C ,The fan would not work at all but I figured that one out after a few hours of tracing wires.Now that the fan is working it works on low,med when you switch it to high it runs the same speed as low.I was reading and old post that said this could be a relay problem but I don't think they ever come up with a solution.
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09-13-2015, 09:22 AM
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#2 |
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Registered User
 
Join Date: Feb 2015
Location: WALLS, MS.
Posts: 190
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Re: Heater fan motor?
Most likely, it's the resistor.
__________________
Tim Yesterday is history, tomorrow is a mystery, today is a gift, that's why it's called "the present". 1971  Sierra Grande LWB, 350/TH350, Factory Air Lots, of future mods planned!!
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09-13-2015, 09:23 AM
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#3 |
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Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
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Re: Heater fan motor?
It could be the high speed relay on top of the inside box behind the glove box
or On mine (with A/C) it was a short ground wire not making contact It is on a relay on the fire wall behind the glove box also Check the ground under the hood to the fan case also Her is a good link with some info http://67-72chevytrucks.com/vboard/s...d.php?t=614941
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John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS Last edited by Hutch; 09-13-2015 at 09:27 AM. Reason: added link |
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