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Heater Blower stopped working?

Tiny
KATHYNWL
  • MEMBER
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 99,125 MILES
My heater blower stopped working today. I went to Auto Zone who sold me a Heater Blower Relay but there isn't a place in the fuse boxes for this relay. The relay looks like it attaches to something like maybe on the firewall but I can't figure out where. I see nothing in the box or the fire wall that resembles the relay I was sold.

If anyone has any suggestions, please let me know. Thanks
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Friday, February 22nd, 2008 AT 6:09 PM

38 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Did you check the fuses also check the motor and the wires around it tap on the motor. This guide will help you test the motor here is a guide as well to check the relay with the relay location in the diagrams below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

and

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

Check out the diagrams (Below). Please let us know what happens.
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Friday, February 22nd, 2008 AT 8:10 PM
Tiny
KATHYNWL
  • MEMBER
  • 3 POSTS
I did check the fuses, and all are fine where is the blower motor was bad, thank you
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Friday, February 22nd, 2008 AT 10:26 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
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Friday, February 22nd, 2008 AT 11:12 PM
Tiny
DANIEL0036
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 56,000 MILES
I have tried several things to get the heater motor to work. It spins when power is jumped to it, I have change the resistor, and the heater switch and still nothing is there a heater motor relay inside the car behind the glove compartment on the fire wall that could be causing this?
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Thursday, November 12th, 2020 AT 5:44 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you check for voltage at the blower connector, with everything turned on? Did you check hvac fuses?

The purple wire from the blower connector goes to the blower relay, according to my info. I don't have an exact location for the relay, sorry.
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Thursday, November 12th, 2020 AT 5:44 PM (Merged)
Tiny
AIRLAW2333
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 172,000 MILES
The blower stopped working, how easy is it to fix myself, I pretty much know nothing about vehicles.
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Thursday, November 12th, 2020 AT 5:45 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi:
The problem may not be the motor. You first need to check if the motor is getting power. If it is, then it's most likely the motor.

As far as replacing it, it's under the dash on the passanger side (a little bit of a pain to get to).

If you are willing to do the work, I can tell you how to do it, but on a scale of 1 to 10, 10 being the worst, it's about a 6.

Let me know.
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Thursday, November 12th, 2020 AT 5:45 PM (Merged)
Tiny
STACIE JOHNSON WHITE
  • MEMBER
  • 1 POST
  • 1997 CHEVROLET BLAZER
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 214,000 MILES
Blower motor has stopped working. I have changed the resistor pack and blower still does not work. I switched the relay on drivers side with the middle relay, they have the same numbers on them. Still no blower fan. A friend ran two wires direct to battery blower fan ran. He said blower motel is good. But when plugged back in with connector it will not run. My fan control in the car would only run on a low speed before blower fan stopped. What next?
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Thursday, November 12th, 2020 AT 5:45 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,864 POSTS
The most likely suspect is the fan motor has tight bearings, and the thermal fuse in the resistor assembly burned open. The same thing may have happened to the new resistor. The clue when running the motor wired directly to the battery is it would have stopped instantly when power was removed, instead of coasting gradually to a stop.

Most GM vehicles use a high-speed relay that bypasses the resistor assembly on just the highest speed. If the thermal fuse is open, the fan should still run on the highest speed, but if it is tight, it will run too slowly. That will cause it to draw excessive current which could overheat the relay contacts.
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Thursday, November 12th, 2020 AT 5:45 PM (Merged)
Tiny
BLEBEL
  • MEMBER
  • 2 POSTS
  • 1996 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
My heater blower will not work.
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Thursday, November 12th, 2020 AT 5:46 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Is there voltage at blower motor?
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Thursday, November 12th, 2020 AT 5:46 PM (Merged)
Tiny
BLEBEL
  • MEMBER
  • 2 POSTS
Have not been able to check that. It is an intermitten problem some times it works some times it doesnt. I did check fuses and replaced the switch panel on the inside of the car.
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Thursday, November 12th, 2020 AT 5:46 PM (Merged)
Tiny
HELDINGFARMS
  • MEMBER
  • 3 POSTS
  • 1996 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 119,000 MILES
My blower motor quit working I have juice at the hi low switch and tried swappping relays on the front firewall but to no success. The motor was not making any noises previously but when I started the car the blower never came on.I am not sure where the blower motor is exactly but is that the problem
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Thursday, November 12th, 2020 AT 5:47 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The blower motor is located on the right rear of engine compartment

Check the AC/Heater fuse no. 6 25amp and also test the blower switch

Apply battery power to the purple wire on the connector at the motor-Did it fire up-if not check the ground on it if okay the motor is gone
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Thursday, November 12th, 2020 AT 5:47 PM (Merged)
Tiny
JOHNLW61
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  • 1 POST
  • 1995 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 202,000 MILES
My fan/blower switch is not working for the heater, ac, etc. And the fuse is good, any ideas? Thankyou
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Thursday, November 12th, 2020 AT 5:47 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
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I would think you should check the blower motor switch. If you have a digital multi meter I can walk you through a test to make sure it is bad. The other thing could be the blower motor resistor on that we can do an ohms test to check it.
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Thursday, November 12th, 2020 AT 5:47 PM (Merged)
Tiny
JOECAIZE
  • MEMBER
  • 1 POST
  • 1993 CHEVROLET BLAZER
Heater problem
1993 Chevy Blazer V8 Four Wheel Drive Automatic

My heater blower is not working, and the radiator is leaking anti-freeze from somewhere, but I don't know where from. Also, the radiator seems to be still filled with anti-freeze and doesn't seem to be losing much fluid, even though there is a leak. What are the problems that could cause this problem?
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Thursday, November 12th, 2020 AT 5:47 PM (Merged)
Tiny
RHALL77
  • MECHANIC
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Blower motor could be caused by a fuse, a resistor, a switch, or even the motor it self. As for the leak, have the cooling system pressure tested to see where the leak is coming from
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Thursday, November 12th, 2020 AT 5:47 PM (Merged)
Tiny
RUPPER
  • MEMBER
  • 1 POST
  • 1991 CHEVROLET BLAZER
  • 120,000 MILES
The heater fan quit working, at first I could bump it and it would work but not anymore!
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Thursday, November 12th, 2020 AT 5:47 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Either the motor has failed or the blower resistor.

Roy
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Thursday, November 12th, 2020 AT 5:47 PM (Merged)

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