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Blower motor not working

Tiny
KMBARRY29
  • MEMBER
  • 2006 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
I had a burnt electrical smell then the blower stopped working. It works intermittently. Can any one help me diagnose the problem?
Friday, December 24th, 2010 AT 8:26 PM

45 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Hello,

It sounds like the blower motor when out or the relay is having an issue lets use this guide to help test the blower motor and to test the relay. I have included the blower motor wiring diagrams and relay location below.

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

and

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

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Friday, December 24th, 2010 AT 9:22 PM
Tiny
KMBARRY29
  • MEMBER
  • 3 POSTS
Im not sure if the smell is from the motor. Yes I do have a multimeter.
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Friday, December 24th, 2010 AT 9:29 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then check to see if the blower motor is getting power. It canbe a ballast resitor, switch, or the motor itself
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Friday, December 24th, 2010 AT 11:24 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Make sure you check it when the blower motor is inop and check the power feed to it and the ground by them self not together.
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Sunday, December 26th, 2010 AT 4:31 PM
Tiny
KMBARRY29
  • MEMBER
  • 3 POSTS
Ok I took apart the blower motor resistor and plug and found the molded end of each melted. Not sure if it happened from loose connection or something else?
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Sunday, December 26th, 2010 AT 4:50 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No it's probably from the blower drawing to much power you should replace it.
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Sunday, December 26th, 2010 AT 5:53 PM
Tiny
BOOPERIII
  • MEMBER
  • 1 POST
Thanks for this post I had this problem and hed to replace the blower motor.
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Monday, March 4th, 2019 AT 6:07 PM
Tiny
CCUNEO
  • MEMBER
  • 5 POSTS
  • 2006 CHEVROLET TRAILBLAZER
Electrical problem
2006 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic 42k miles

I know the hi blower fan is usually controlled/protected by a seperate fuse or fusible link. My glove box manual makes no reference to this. Where can I find the fuse/fusible link/relay etc that controls the hi blower.
Thx Cory
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hi Cory,

The Blower Relay should be located in the Under Hood fuse block.

Also, it usually work the other way around and the only fan speed that works would be the High. However, have you check out the Blower Motor Resistor? It is located under the passenger dash in the duct work near the blower motor.

.
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
CCUNEO
  • MEMBER
  • 5 POSTS
So your saying there is no seperate fuse protecting the hi blower? Seen that for years on GM cars. How exactly do I check out the resistor? Any chance of a pic?
Thx Cory
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Here is the test proceedure.....

You can press your "ctrl" key and the "+" key to zoom in to see if you can read it any better. if you can't let me know and I will email the pics to you...


https://www.2carpros.com/forum/automotive_pictures/188069_2006trailblazerblowertests_1.jpg




https://www.2carpros.com/forum/automotive_pictures/188069_2006trailblazerblowertests2_1.jpg




https://www.2carpros.com/forum/automotive_pictures/188069_2006trailblazerblowertests3_1.jpg



Here is a pic of the resistor location...


https://www.2carpros.com/forum/automotive_pictures/188069_06trailblazerblowerresistor_1.jpg



.
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
JOHNABLAO
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 183,939 MILES
2003 Chevrolet Trailblazer. Blower motor not working in all speeds, have already replaced the resistor could it be the switch
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
CCUNEO
  • MEMBER
  • 5 POSTS
OK,
had a warm day today so I decided to test things according to the info in the last post. It turns out if I "jiggle" the multi wire plug that goes into the resistor assembly the hi blower comes on. Doesnt appear to be one of the wires going into the plug but the assembly itself. Can that assembly be replaced by itself or does the whole blower motor have to be changed?
Cory
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the blower switch and blower motor itself-
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
You can replace just the blower resistor there should be only 2 screws holding it in.... here is a pic of the resistor...


https://www.2carpros.com/forum/automotive_pictures/188069_06trailblazerblowerresistor_2.jpg



.
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
DEANNM
  • MEMBER
  • 1 POST
  • CHEVROLET TRAILBLAZER
I have a 2005 trailblazer. It has a front ac/heater fan and a rear one. The had completely quit blowing any air form the ac, heater and defrost. My back one still works fine. Can you please tell me why what may have quit working to cause this? Can you also tell me the part I would need to replace. My warrenty is up by just 6000 miles.
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
This system, especially if auto temp control, is quite complicated to test even with the right scantool, if you have a warrantee, don't walk, RUN to the shop.
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
If you cant hear the blower motor, start by checking all fuses. Then use a test light to check for power at the blower motor when it is turned on, in all fan speed positions. If there is power but no blower, then the motor is bad.
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
MRHAPPY
  • MEMBER
  • 8 POSTS
  • 2003 CHEVROLET TRAILBLAZER
Electrical problem
2003 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic

The fan acted strange one day then quit working all together the next. None of the selectable speeds turn on the fan. I checked all the relays and fuses under the hood, nothing was wrong there. With the hood open I turned on the climate control defroster and heard the a/c compressor turn on. What should I do next to find out or narrow the probable failures down.
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Monday, March 4th, 2019 AT 6:08 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Place heater fan at hi
disconnect blower motor and check for ground and battery volts at the disconnected wire if you have both remove and replace blower motor
if not suspect blower motor speed resister
Blower Motor Resistor Assembly Located Below right side of dash, near blower motor
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Monday, March 4th, 2019 AT 6:08 PM (Merged)

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