Blower motor speeds

Tiny
SIERRA GUY
  • MEMBER
  • 1997 GMC C1500
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
All 4 blower speeds work, but if I turn knob to off position and then turn back on it might not come back on. Or it could take 5-10 minutes and it will work again. I just leave it on lowest speed now and it works fine.
Got any ideas?
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Tuesday, February 2nd, 2016 AT 2:27 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
It sounds like a relay issue. Check under the hood for the blower motor relay and switch it with another one with the same part number to see if it fixes the problem.
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Tuesday, February 2nd, 2016 AT 6:05 PM
Tiny
SIERRA GUY
  • MEMBER
Where approximately under the hood is the relay?
Thanks for your help.
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Tuesday, February 2nd, 2016 AT 6:29 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
There should be a relay box. IT will be a black plastic box and is usually mounted on the inner fender.
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Wednesday, February 3rd, 2016 AT 4:30 PM
Tiny
SIERRA GUY
  • MEMBER
Under hood relay box has an AC relay that is a 4 prong relay and blower motor relay is a 5 prong relay. Any idea where else it might be? I'd rather not deal with the dealership.
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Thursday, October 20th, 2016 AT 2:01 PM
Tiny
SIERRA GUY
  • MEMBER
Found relay behind glove box, right beside the resistor.
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Sunday, October 23rd, 2016 AT 12:20 PM
Tiny
SIERRA GUY
  • MEMBER
Pain in the butt to get to, but it's all good now.
Thanks for your help
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Monday, October 24th, 2016 AT 1:55 PM
Tiny
SIERRA GUY
  • MEMBER
Still having problems. Resistor and relay are good so was wondering if switch or pigtail located on and behind control panel could be the culprit. If pigtail shows burnt wires should I also replace switch?

Thanks in advance for any advice you might have for me.
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Friday, January 20th, 2017 AT 5:56 PM
Tiny
KEN
  • ADMIN
Hey SIERRA GUY,

Is sounds like the blower motor is going bad, here is a guide that will help you find the problem.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Run some tests and get back to us so we can continue helping you.

Best, Ken
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Tuesday, January 24th, 2017 AT 4:18 AM
Tiny
SIERRA GUY
  • MEMBER
Y'all were right. Finally broke down and installed new blower motor. Pain in the butt to get 5th bolt out so just used 4 on new install. Works great and I've now got ac again.

P.S. Old one was dated Dec 1996, guess I was lucky it lasted this long.

Thanks again, Tom
Y'all are the best
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Saturday, April 29th, 2017 AT 4:24 PM
Tiny
KEN
  • ADMIN
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Monday, May 1st, 2017 AT 8:14 PM

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