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?

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



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