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Check engine light it comes on when I turn the blower or fan on?

Tiny
CORRECTIONSGIRL2
  • MEMBER
  • 2007 SATURN VUE
  • 3.5L
  • 4WD
  • AUTOMATIC
  • 138,000 MILES
Why does a check engine light come on when I turn the heat on, it comes on when I turn the blower or fan on?
Saturday, November 2nd, 2024 AT 1:03 PM

15 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,345 POSTS
It sounds like you have an alternator that might be bad or the blower motor is pulling too many amps. We will know for sure if you run the codes to see which ones are stored. Please go over this guide to help you see which codes they are so we can fix the car.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Here is the blower motor location in case you have a low voltage code. Please go over this guide and get back to us.
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Saturday, November 2nd, 2024 AT 5:22 PM
Tiny
CORRECTIONSGIRL2
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I actually have no idea what those diagrams are and what I'm supposed to do with it, lol. I did a scan, and it had code p0705.
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Saturday, November 2nd, 2024 AT 5:37 PM
Tiny
KEN L
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It just shows what needs to be done to check out the problem so you have an idea of what the repair will entail. This code should not have anything to do with the blower motor.

The P0705 code on a 2007 Saturn Vue indicates an issue with the Transmission Range Sensor (TRS) Circuit.

Could it be that the blower motor operation is just a coincidence? Just it has the problem each time you turn the blower motor on, can you please shoot a quick video with your phone so I can tell for sure what's going on. You can upload it here with your response.
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Sunday, November 3rd, 2024 AT 11:18 AM
Tiny
CORRECTIONSGIRL2
  • MEMBER
  • 13 POSTS
That was the second time I got that code when I turned the blower on, then when I did a scan, I got the P0705 error code.
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Sunday, November 3rd, 2024 AT 3:54 PM
Tiny
KEN L
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Lets clear the codes and try the blower motor again to see if the trouble code comes back.
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Monday, November 4th, 2024 AT 9:33 AM
Tiny
CORRECTIONSGIRL2
  • MEMBER
  • 13 POSTS
Okay, I will let you know when I do.
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Monday, November 4th, 2024 AT 5:49 PM
Tiny
CORRECTIONSGIRL2
  • MEMBER
  • 13 POSTS
I drove for 5 minutes with the fan on, no dash light, I turned the car off for 30 minutes. I turn drove 5 minutes, turned the fan on and got a dash light. I did a scan with the fan on and got the same transmission error so I cleared the codes and scanned I got no errors, but the dash light stayed on.
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Tuesday, November 5th, 2024 AT 9:03 AM
Tiny
KEN L
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I don't think the blower motor will make this code, can you try it again without turning on the blower motor to see if you get the same code?
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Tuesday, November 5th, 2024 AT 10:33 AM
Tiny
CORRECTIONSGIRL2
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I don't get it unless I turn on the fan.
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Tuesday, November 5th, 2024 AT 11:28 AM
Tiny
CORRECTIONSGIRL2
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I don't get it unless I turn on the fan
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Tuesday, November 5th, 2024 AT 11:28 AM
Tiny
KEN L
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The fan motor must be causing turbulence in the electrical system, I would replace the blower motor and then clear the codes, please let me know what happens.
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Wednesday, November 6th, 2024 AT 9:11 AM
Tiny
CORRECTIONSGIRL2
  • MEMBER
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Okay, I will.
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Wednesday, November 6th, 2024 AT 9:14 AM
Tiny
CORRECTIONSGIRL2
  • MEMBER
  • 13 POSTS
I disconnected the battery overnight and I don't get an error code when I turn my blower on. I scanned It and got no error codes.
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Sunday, November 17th, 2024 AT 10:07 PM
Tiny
CORRECTIONSGIRL2
  • MEMBER
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My car has a burnt smell after driving only 10 minutes and when I open the hood its very hot.
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Sunday, November 17th, 2024 AT 10:08 PM
Tiny
KEN L
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I am glad you got the problem fixed :) Sorry, we only handle one problem per thread, please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Monday, November 18th, 2024 AT 10:34 AM

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