Question about 1998 GMC Sierra

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1998 gmc sierra blower motor runs Intermittently

I beleive the resistor is failing and need to know how to replace it. I see the wire harness entering the firewall but when looking from the engine compartment I cannot see how to remove.

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Does anyone know what the problem is???? 1998 GMC Sierra blower motor problem.... when fan is turned on it works fine then all of a sudden it makes a loud screeching noise and sounds like its gonna blow up, does it on all speeds. please help

Posted on Dec 30, 2009

  • oldsparky55 Sep 04, 2011

    Just fixed mine- removed glove compartment lid, remove purple and black wires. lift tab on top of cover and pull cover down and out (very difficult) put a drop of oil on end of shaft.

    I SHOULD HAVE- drilled a small hole through cover at center of motor hub and oiled the shaft through the hole

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The resistor is mounted in the blower housing. Unplug the wire harness and remove the 2 mounting screws, out she comes! Frankster016

Posted on Dec 06, 2008

  • frankster016 Dec 07, 2008

    JUst reread the question. The word 'intermittently' tells me the resistor is not the prob!! Big Poppa has is on the right track! Take it to a shop and run a scan to pin-point the prob. Frankster016

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If you turn your ac on max, the radiator fan should run, if you turn it off, it should turn off. If it does not, than its more than a resistor, its your sensor that tells the fan to run or not. Your ecm, pcm may have gone bad

Posted on Dec 06, 2008

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3 Answers

How doi locate the resistor for a blower motor on a 1997 gmc sierra 1500


Hi!!
Check under dash, passenger side, if necessary, remove cover to access Blower Housing Assy., the harness has two terminals, one for the Blower Motor and one for the Blower Motor RESISTOR which is fastened by two 7 or 8 mm. screws to the Housing.
Here is a picture of the Blower Housing Assy. showing the Resistor.
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Good Day!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

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1 Answer

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The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.

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1 Answer

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4 Answers

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Your blower moter is under your glovebox and very easy to replace.I dont think thats your ploblem.I would pull off the dash.It will snap right off without breaking anything.Then pull out the part that holds the selector switch for the fan speed.Then you unplug that switch.Clean the copper contacts.Plug it back in.If everything works again like it should and did in my truck then it is either that switch that is bad or the wiring harness.I would replace that switch.

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