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01-27-2019, 05:51 PM
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#1 |
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Registered User
Join Date: Dec 2018
Location: Algonquin, IL
Posts: 28
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Thrift-Air Heater issues... '64 C10
Could this be a resistor problem? Need your expert advice...
I keep replacing fuses in the block, for the heater. The switch seems to work fine (all three fan speeds) each time I replace a fuse. HOWEVER, the fan seems to blow fuses when I rev the engine a bit, and the speed of the fan increases with acceleration. Based on some of the things I have read about the Thrift-Air system, it sounds like a bad resistor (?) There seems to be no other electrical issues with this '64 C10, but could it also be a voltage regulator causing this? I know enough to be dangerous, about electrical issues... Any advice or opinions are welcome! Thanks! |
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01-28-2019, 01:43 PM
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#2 |
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Registered User
Join Date: Dec 2018
Location: Algonquin, IL
Posts: 28
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Re: Thrift-Air Heater issues... '64 C10
With all the expertise and experience on this board, I'm surprised that I have had no replies to my question. Anybody??
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01-28-2019, 01:54 PM
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#3 |
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Registered User
Join Date: Feb 2012
Location: pleasant valley--placerville ca
Posts: 3,039
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Re: Thrift-Air Heater issues... '64 C10
Nothing to test with? No volt meter? Run a wire from the fuse block to the fan motor by-passing the resister and switch and see if it blows the fuse. Go buy a cheap volt meter.
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1961 chevy K10 my build is------------61K10 build |
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01-28-2019, 02:51 PM
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#4 |
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Registered User
Join Date: Dec 2018
Location: Algonquin, IL
Posts: 28
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Re: Thrift-Air Heater issues... '64 C10
Makes sense... Thanks!
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01-28-2019, 04:02 PM
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#5 |
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Registered User
Join Date: Oct 2016
Location: San Diego, CA
Posts: 549
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Re: Thrift-Air Heater issues... '64 C10
Without any testing, which is the correct way to diagnose this, I would say unplug the blower motor, replace the fuse, move the fan switch around as you rev it and see if it blows.
If not , 75% chance it's the blower motor. What size fuse are you using? How many amps? Factory wiring or aftermarket?
__________________
Everybody has to believe in something. I believe I'll have another beer. |
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01-28-2019, 04:09 PM
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#6 |
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Registered User
Join Date: Dec 2018
Location: Algonquin, IL
Posts: 28
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Re: Thrift-Air Heater issues... '64 C10
It seems to blow the fuse when the switch is on High (but it may have done it on the lower settings also). A 10-amp fuse is what's required, and is what I'm replacing each time. Everything is original GM, no aftermarket, and apparently original. The good thing is that fan motors aren't very expensive to replace if that's the issue.
Thanks! |
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01-28-2019, 04:56 PM
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#7 |
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Registered User
Join Date: Dec 2018
Location: yamhill OR
Posts: 827
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Re: Thrift-Air Heater issues... '64 C10
I would all so check all the wires going to the switch and all the wires to the resistor and the wire to the fan make shore that none are cracked and shorting out on any thing under
the dash. All so if you have not all ready, check out the resistor. the one in my truck was falling apart. (careful, I don't know what there made out of mine looked like it was asbestos but I don't know) Like some others said it may be the fan motor take the motor out and see if it spins freely, if not it could be causing the problem.
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1965 chevy c20 292 4speed http://67-72chevytrucks.com/vboard/s...d.php?t=777601 1976 chevy c10 250 4speed http://www.67-72chevytrucks.com/vboa...d.php?t=787037 1978 chevy c20 350 4speed 1998 chevy c1500 4.3L 5speed 2002 Chevy s10 4.3L auto 4x4 Plus a Mercury & some Fords... To many projects! |
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01-28-2019, 09:29 PM
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#8 |
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Registered User
Join Date: Dec 2018
Location: Algonquin, IL
Posts: 28
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Re: Thrift-Air Heater issues... '64 C10
Thanks for the info everyone!
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