Heater fan question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pritch · 03-05-2007, 07:55 PM

My heater fan quit working and it's driving me nuts. How does that circut work? How does the fan know what speed to run? I am getting 8 volts at the fan motor w/ the switch on high, and 12 volts w/ it on medium. But here's the thing, when I jump 12 volts directly to the fan motor, it runs great. Now, that tells me I have bad connection to the fan, OK, I can deal with that, but what about the 8 volts on high? I could not get the fan to run at all with the connector on the end of the wire, I didn't try putting a new connector on yet-I hate to cut the stock one off. What happens if I just wire up the fan to a toggle switch for now?

chops333 · 03-05-2007, 07:59 PM

theres a switch block in the duct under glove box maybe the problem good luck

sb69chevy · 03-05-2007, 08:07 PM

I have mine wired to a toggle. So far, so good.

woodrow59 · 03-05-2007, 08:34 PM

I had a similar problem Hope this helps

http://67-72chevytrucks.com/vboard/s...d.php?t=227908

pritch · 03-05-2007, 10:28 PM

Quote:

Originally Posted by woodrow59

I had a similar problem Hope this helps

http://67-72chevytrucks.com/vboard/s...d.php?t=227908

Thanks for the link, woodrow-and thanks for the other answers. I think for now I'm just going to run it through a toggle switch. I'll probably not drive it much before summer anyway. I'll figure out what's really wrong with it then.

03-05-2007, 07:55 PM	#1
pritch Registered User Join Date: Mar 2004 Location: Hoytsville, Utah Posts: 3,365	Heater fan question My heater fan quit working and it's driving me nuts. How does that circut work? How does the fan know what speed to run? I am getting 8 volts at the fan motor w/ the switch on high, and 12 volts w/ it on medium. But here's the thing, when I jump 12 volts directly to the fan motor, it runs great. Now, that tells me I have bad connection to the fan, OK, I can deal with that, but what about the 8 volts on high? I could not get the fan to run at all with the connector on the end of the wire, I didn't try putting a new connector on yet-I hate to cut the stock one off. What happens if I just wire up the fan to a toggle switch for now? __________________ '68 Panel Project Boogie Chillin' '68 C-10 Ol' Green

03-05-2007, 07:59 PM	#2
chops333 Registered User Join Date: Aug 2005 Location: mount airy n.c. Posts: 243	Re: Heater fan question theres a switch block in the duct under glove box maybe the problem good luck

03-05-2007, 08:07 PM	#3
sb69chevy Registered User Join Date: Oct 2006 Location: Springfield, MO Posts: 375	Re: Heater fan question I have mine wired to a toggle. So far, so good. __________________ 1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride)

03-05-2007, 08:34 PM	#4
woodrow59 OzarkHillbilly in Atlanta Join Date: May 2002 Location: Douglasville, Ga. Salem, Mo. Posts: 386	Re: Heater fan question I had a similar problem Hope this helps http://67-72chevytrucks.com/vboard/s...d.php?t=227908 __________________ 72 custom/10 LWB 68 Longhorn C20 Custom Camper (sold)



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