72 chevy c/10 heater fan issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

scotty72 · 12-01-2016, 05:47 PM

Can anyone help determine why my heater fan isn't working on my 72 c/10 w/ ac ? My control switch makes the relay click when I go to lo, but fan doesn't work in any speed. Thanks

**LockDoc** · 12-01-2016, 05:56 PM

Quote:

Originally Posted by scotty72

Can anyone help determine why my heater fan isn't working on my 72 c/10 w/ ac ? My control switch makes the relay click when I go to lo, but fan doesn't work in any speed. Thanks

Try unplugging the heater motor under the hood and run a jumper wire from the battery to the +12v connector on the motor and see if it runs.

LockDoc

**pound41** · 12-01-2016, 10:27 PM

Not going to be any help but mine does that on every speed except medium. I have replaced everything blower motor relay switches. Ran a ground wire to the battery. No luck

**LockDoc** · 12-02-2016, 01:51 AM

Quote:

Originally Posted by pound41

Not going to be any help but mine does that on every speed except medium. I have replaced everything blower motor relay switches. Ran a ground wire to the battery. No luck

Did you replace the heater resistor?

LockDoc

cdowns · 12-02-2016, 01:39 PM

you could always REMOVE THE FAN AND CHECK IT ON A BENCH WITH A BATTERY CAHARGER AND WHILE IT'S OFF CLEAN OUT THE CAVITY OF 45YEARS OF BUILT UP CRAP TO ALLOW AIR TO FLOW WHEN YOU GET IT TO WORK

12-01-2016, 05:47 PM	#1
scotty72 Registered User Join Date: Feb 2008 Location: ventura,ca. Posts: 1	72 chevy c/10 heater fan issues Can anyone help determine why my heater fan isn't working on my 72 c/10 w/ ac ? My control switch makes the relay click when I go to lo, but fan doesn't work in any speed. Thanks

12-01-2016, 10:27 PM	#3
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,269	Re: 72 chevy c/10 heater fan issues Not going to be any help but mine does that on every speed except medium. I have replaced everything blower motor relay switches. Ran a ground wire to the battery. No luck

12-02-2016, 01:39 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: 72 chevy c/10 heater fan issues you could always REMOVE THE FAN AND CHECK IT ON A BENCH WITH A BATTERY CAHARGER AND WHILE IT'S OFF CLEAN OUT THE CAVITY OF 45YEARS OF BUILT UP CRAP TO ALLOW AIR TO FLOW WHEN YOU GET IT TO WORK __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY



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