Question about 2003 GMC Sierra

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Heater fan wont shut off when i put the fuse back in it takes about to minutes to come up on hi could it be the resister

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Underneath passenger side controls setting how fast yes its resistor.good luck right next to blower fan black box with harness plug and a coil

Posted on Feb 07, 2010

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I have a 1999 Jeep Wrangler and the heater fan stopped working for all the fan speeds. The fuses are fine. How do you know if it is the blower resistor or the blower motor?


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Heater wont work a fuse maybe? some how I doubt it. the rear window heater works. fan dead perhaps? no fan at all. not sure about heat.


Hi: Sounds like a possible heater resistor problem. First check to see if heater fan working, unplug heater under hood and put 12 volts to it from the battery with a wire (single black wire running to back of fan). If works then problem probably the resistor which is located on the fan housing under the hood to the right of the fan. The resistor has wires to it running from the heater fan, 2 - 7mm screws holding resistor in place, check resistor to see if any of the 3 elements are melted off, if so replace. Note: Rear window defrost has nothing to do with heater fan. Hope this helps...

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When I turn off my 1988 Buick Lasabre the heater fan stays on.


Check where the wiring goes into the fan motor itself.The power probably goes there first into a blower motor resister.If the resister is shot many times its the same symptoms your describing.If you dont know what it looks like you could stop at a auto parts store to see.

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you should be able to pull the block out insert new block and plug plug back in and it should come to life.

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