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Blower motor not working

Tiny
HOT IN PA
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 270,000 MILES
Replaced blower motor and control module. Also replaced the 10 amp fuse under the hood.
Sunday, July 21st, 2019 AT 11:15 AM

20 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Hello,

Does the fuse have power this guide will help and there are two other fuses that must be checked as well. Here are the blower motor wiring diagrams so you can see how the system works and which fuses to check also with a guide to help you check for power along with the fuse locations below.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Monday, July 22nd, 2019 AT 3:28 PM
Tiny
HOT IN PA
  • MEMBER
  • 2 POSTS
Fixed. It was the 40 amp fuse. Must have blown when the AC went out. Thank you.
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Monday, July 22nd, 2019 AT 3:31 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
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Tuesday, July 23rd, 2019 AT 12:46 PM
Tiny
DANA1550
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
It appears no fuse is blown. Is this the fan motor itself?
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Grab a test light and check for power and ground at the motor. If it has both when turned on the motor is bad, otherwise it may be the blower motor resistor. Follow the wiresfrom the motor to the resistor, should be near the motor mounted in the HVAC plenum
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
LANIJEFF
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET TAHOE
  • V8
  • 2WD
  • AUTOMATIC
  • 99,000 MILES
The switch that contols the A/C & heater blower has settings 0 - 5. Initially, the blower quit working on setting 1, then it quit working on setting 2. Presently, you have to crank the blower up to setting 3 to get any air blow from the vents. The air blows out pretty hard on setting 3 so it becomes too much air very quickly. This same problem has happended before and I paid the dealer to fix it. I have seen the same problem in other cars. Obvioulsy, this is a common problem. Please advise how to fix it. Thank you very much for your help.
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Chances are the blower motor resister is bad. Stop at a nationally recognized parts store and get one. They are cheap. As far as replacement, it is located near the blower motor and has one electrical plug and (I think) two screws that hold it in place.
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
RGALIS
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET TAHOE
  • 155,500 MILES
My 2001 tahoe Rear blower not working nothing coming out rear either hot or cold front seems to be working fine checked blower fuses already did heater core flush checked under dash for blend door I am stumped.

Please help winter in coming
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Hello,

This sounds like the blower motor has failed but to be sure we can check for power and ground back at the blower motor here is a guide and some diagrams below so you can get the problem fixed.

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

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
ADRIENNE
  • MEMBER
  • 4 POSTS
  • 2003 CHEVROLET TAHOE
My fan blower is not working. I replaced the resistor that was not it. What else could it be?
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the blower motor itself and the blower switch-check and test
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
ADRIENNE
  • MEMBER
  • 4 POSTS
Thank you. I will try that next.
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
ADRIENNE
  • MEMBER
  • 4 POSTS
How do you extract the fan motor?
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Tuesday, July 23rd, 2019 AT 1:16 PM (Merged)
Tiny
TIDOJAXON4
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 159,000 MILES
I installed a car stereo in my Tahoe myself. The heat was working fine before I started but then after I turned the knob for the heater and no heat blew through the panels, not even when I had it all the way on high. I checked to see if maybe some wiring either came undone or was not pushed all the way in and it was fine. I checked the fuses that looked like they might have to do with the heater and those were fine. The only thing I can think of is I may have pulled something loose near the engine because I disconnected the coolant container to try to find a place to run my power cable through. The other day I lifted the hood while my car was running and I saw hot air coming out close to the firewall closer to the passenger side of the car.
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Tuesday, July 23rd, 2019 AT 1:17 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Can you hear the blower motor running?

Where is that hot air coming from, that you were talking about?
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Tuesday, July 23rd, 2019 AT 1:17 PM (Merged)
Tiny
TERRY LEE
  • MEMBER
  • 6 POSTS
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 189 MILES
Blower doesnt work on floor or heater works thru dash
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Tuesday, July 23rd, 2019 AT 1:17 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
You are dealing with a vacuum leak. The air flow vents are actuated by vacuum. If there is a leak, it won't change direction. Check for leaks under the dash. If you are lucky, you may hear a hissing sound when the engine is running.

Let me know what you find.
Joe
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Tuesday, July 23rd, 2019 AT 1:17 PM (Merged)
Tiny
TERRY LEE
  • MEMBER
  • 6 POSTS
My blower runs back wards high air is on low and off is on high if it shut off. No air thru defroster just dash
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Tuesday, July 23rd, 2019 AT 1:17 PM (Merged)
Tiny
TERRY LEE
  • MEMBER
  • 6 POSTS
My heater motor wont shut off and runs back wards blows good out of dash but not defroster or floor
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Tuesday, July 23rd, 2019 AT 1:17 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
You are dealing with a vacuum leak which is causing the air flow problem. Check under the dash for leaks. If you are lucky, with the engine running, you may hear a hissing sound from the leak.

As far as the electrical issue, wither the fan switch has shorted or the blower motor resister.
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Tuesday, July 23rd, 2019 AT 1:17 PM (Merged)

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