heater blower - The 1947 - Present Chevrolet & GMC Truck Message Board Network

quik8outlaw · 10-25-2013, 06:32 PM

My blower on my heater went out this morning. just quit, then came back on for a minute, then went off again. I checked the fuse, its ok. checked all connections, they are ok. I pulled off the wire that plugs into the blower motor, and checked it with a test light, didn't get any current. could it be the switch ? are they prone to go bad ? maybe a bad motor ? any ideas ? thanks.

tlawre87 · 10-25-2013, 06:42 PM

Hook the blower up to the battery with a jumper wire. See if it turns on.

If its an ac truck could be a bad relay. (not sure if the non-ac has a relay) Be sure to check the resistor as well.
The blower in mine is 39 years old. Still works fine. The relay has been replaced.

quik8outlaw · 10-25-2013, 06:46 PM

it is a a/c truck, where will I find the relay, and the resistor ? thanks for the help.

tlawre87 · 10-25-2013, 07:44 PM

The top circle is the resister (one going into the HVAC box.) Bottom is the relay. Visual inspection normally works for the resistor.

tucsonjwt · 10-25-2013, 08:45 PM

If above checks don't work, you might have to remove the HVAC dash control and wiggle the harness connector to the control. My truck had a bad harness and was not making a good connection. A new AC Delco harness is still available if that is your problem.

quik8outlaw · 10-26-2013, 04:22 PM

thanks for the help

10-25-2013, 06:32 PM	#1
quik8outlaw Registered User Join Date: Apr 2013 Location: covington, ga. Posts: 8	heater blower My blower on my heater went out this morning. just quit, then came back on for a minute, then went off again. I checked the fuse, its ok. checked all connections, they are ok. I pulled off the wire that plugs into the blower motor, and checked it with a test light, didn't get any current. could it be the switch ? are they prone to go bad ? maybe a bad motor ? any ideas ? thanks.

10-25-2013, 06:42 PM	#2
tlawre87 Registered User Join Date: Jun 2012 Location: Meeker, ok Posts: 146	Re: heater blower Hook the blower up to the battery with a jumper wire. See if it turns on. If its an ac truck could be a bad relay. (not sure if the non-ac has a relay) Be sure to check the resistor as well. The blower in mine is 39 years old. Still works fine. The relay has been replaced. __________________ Trevor 74 C20...work in progress. 04 Saturn Ion...Daily Driver

10-25-2013, 06:46 PM	#3
quik8outlaw Registered User Join Date: Apr 2013 Location: covington, ga. Posts: 8	Re: heater blower it is a a/c truck, where will I find the relay, and the resistor ? thanks for the help.

10-25-2013, 07:44 PM	#4
tlawre87 Registered User Join Date: Jun 2012 Location: Meeker, ok Posts: 146	Re: heater blower The top circle is the resister (one going into the HVAC box.) Bottom is the relay. Visual inspection normally works for the resistor. Attached Images __________________ Trevor 74 C20...work in progress. 04 Saturn Ion...Daily Driver

10-25-2013, 08:45 PM	#5
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,188	Re: heater blower If above checks don't work, you might have to remove the HVAC dash control and wiggle the harness connector to the control. My truck had a bad harness and was not making a good connection. A new AC Delco harness is still available if that is your problem.

10-26-2013, 04:22 PM	#6
quik8outlaw Registered User Join Date: Apr 2013 Location: covington, ga. Posts: 8	Re: heater blower thanks for the help



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