98 GMC ac/heater blower quit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dw98gmc · 06-08-2008, 06:43 PM

Driving into town yesterday with ac on and blower running fine. Hit a bump and it quit. Checked the fuse panel and found it had blown the 25 A fuse in the blower circuit. Replaced the fuse but the blower is dead.

I pulled the dash panel loose to look for broken wire on the back side of the fan on/off speed control, but all looked fine. I've had that problem on another Chevy truck, same year etc.

Anybody have any idea as to where to look for common cause for this - maybe broken wire, etc.?

I'd sure appreciate any help!!

Thanks,

Dwayne

*MonteSS454* · 06-08-2008, 10:44 PM

Try replacing the Blower switch on the HVAC (Dash).

gchemist · 06-09-2008, 12:02 AM

Pull the plug off the fan. Turn on the A/C. Using a voltmeter check for power. If you have power at the plug, the ground from fan is bad. Cut the ground wire and ground it as close as possible to the alternator.

dw98gmc · 06-11-2008, 10:03 AM

Hey thanks a lot for your help. I'll do what gchemist suggested first - should have thought of that first myself.
Thanks again!;-)

**Bob B.** · 06-11-2008, 11:04 PM

What happens a lot on those is the motor housing becomes corroded on the inside. If you have power and ground, chances are pretty good this is the problem. Only real fix is a new blower motor.

06-08-2008, 06:43 PM	#1
dw98gmc Registered User Join Date: Oct 2006 Location: branson,mo Posts: 9	98 GMC ac/heater blower quit Driving into town yesterday with ac on and blower running fine. Hit a bump and it quit. Checked the fuse panel and found it had blown the 25 A fuse in the blower circuit. Replaced the fuse but the blower is dead. I pulled the dash panel loose to look for broken wire on the back side of the fan on/off speed control, but all looked fine. I've had that problem on another Chevy truck, same year etc. Anybody have any idea as to where to look for common cause for this - maybe broken wire, etc.? I'd sure appreciate any help!! Thanks, Dwayne

06-08-2008, 10:44 PM	#2
MonteSS454 Account Suspended Join Date: Jun 2007 Location: Claremore, Oklahoma Posts: 821	Re: 98 GMC ac/heater blower quit Try replacing the Blower switch on the HVAC (Dash).

06-09-2008, 12:02 AM	#3
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: 98 GMC ac/heater blower quit Pull the plug off the fan. Turn on the A/C. Using a voltmeter check for power. If you have power at the plug, the ground from fan is bad. Cut the ground wire and ground it as close as possible to the alternator. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

06-11-2008, 10:03 AM	#4
dw98gmc Registered User Join Date: Oct 2006 Location: branson,mo Posts: 9	Re: 98 GMC ac/heater blower quit Hey thanks a lot for your help. I'll do what gchemist suggested first - should have thought of that first myself. Thanks again!;-)

06-11-2008, 11:04 PM	#5
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,306	Re: 98 GMC ac/heater blower quit What happens a lot on those is the motor housing becomes corroded on the inside. If you have power and ground, chances are pretty good this is the problem. Only real fix is a new blower motor. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.



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