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Blower Motor constantly runs?

Tiny
SOXLOVER
  • MEMBER
  • 2012 CHEVROLET SILVERADO
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 147,300 MILES
Replaced blower motor, resistor and relay. Still has 12v to blower plug even when the key is in the off position. Figuring it is a short to power from another circuit. Any suggestions where to start?
Tuesday, August 16th, 2022 AT 3:48 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Hi,

If you remove fuse 70 in the under-hood fuse box, does the motor turn off? That is the power supply for the blower motor. Let me know.

Also, I attached a pic below the junction box on the right side of the dash. If the blower fuse doesn't turn it off, start removing one fuse at a time to see which one does.

Let me know.

Joe

See pic below.
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Tuesday, August 16th, 2022 AT 8:10 PM
Tiny
SOXLOVER
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  • 4 POSTS
Pulling fuse 70 did stop the blower.
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Wednesday, August 17th, 2022 AT 5:24 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Then we don't have a short to a different circuit. I suspect either the connector at the blower motor control module is damaged or the module itself is bad.

If you look below, I attached the directions for the removal and replacement of the module. What to do is first disconnect it and inspect the connector. If it appears okay, then suspect the module.

Let me know what you find,

Joe

See pics below.
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Wednesday, August 17th, 2022 AT 7:38 PM
Tiny
SOXLOVER
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  • 4 POSTS
I have ordered a new module, I will let you know the outcome after I get it. Everything started going wacky after I replaced it. I have checked the connectors several times. So. I may have just got a bad module. Thank you. I will keep you apprised.
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Wednesday, August 17th, 2022 AT 8:58 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Hi,

By chance, did you get the module online? If you did, you certainly could have gotten a bad module. I have seen so many online parts fail right out of the box.

Let me know.

Joe
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Thursday, August 18th, 2022 AT 6:42 PM
Tiny
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Okay, module replaced and everything works. Thank you for all your help. I was about to pull the last of what little hair I have left out.

Tom
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Saturday, August 20th, 2022 AT 9:36 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
LOL, Tom, vehicles have made me do the same. Regardless, thank you for the update. I'm glad it's working for you.

Take care of yourself and please feel free to come back anytime in the future if you have questions. You're always welcome here.

Joe
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Saturday, August 20th, 2022 AT 9:31 PM

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