heater blower doesn't run - AC Auto Repair Help Forum


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heater blower doesn't run

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battcave
Novice

Jan 10, 2010, 3:13 PM

Post #1 of 3 (2667 views)

heater blower doesn't run	Sign In

I have a 1979 GMC Jimmy that I use as a plow truck. The blower motor failed and I replaced it with new. Still didn't work so I verified fuses were good. Troubleshot back to an open coil on the blower control relay and replaced. Still doesn't work. What's left besides the control panel?

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(This post was edited by Hammer Time on Jan 10, 2010, 4:14 PM)

steve01832
Veteran
steve01832 profile image

Jan 10, 2010, 6:48 PM

Post #2 of 3 (2654 views)

Re: heater blower doesn't run	Sign In

Unplug the blower motor connector and put a test light or multimeter from the wire to ground. Turn the fan to high. If the light comes on bright or the meter shows battery voltage, take a jumper wire from battery ground terminal and connect the other end to the blower motor housing. If it sparks and the motor comes on, run a jumper wire permanently from a good ground to one of the motor hold down bolts.

Steve

battcave
Novice

Jan 10, 2010, 8:50 PM

Post #3 of 3 (2645 views)

Re: heater blower doesn't run	Sign In

Definately not a ground issue. Can bypass relay and put power directly to blower connector and it runs full steam ahead. Already verified no power to relay coil with the blower turned on. Removed, disassembled and cleaned the blower speed switch (it definately needed it) and while there I checked for power to switch. No power found. Still seems like a fuse issue to me but Acc/Heater fuse is good. Can't find a wiring diagram on line. Might have to suck it up and buy a manual.

Thanks

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