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Search Auto Parts Search heater blower doesn't run Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum battcave Novice Jan 10, 2010, 3:13 PM Post #1 of 3 (2373 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? Links removed (This post was edited by Hammer Time on Jan 10, 2010, 4:14 PM) steve01832 Veteran Jan 10, 2010, 6:48 PM Post #2 of 3 (2360 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 (2351 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   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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