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HVAC heat issue?

Tiny
BHAMDOC1973
  • MEMBER
  • 2009 BMW 335
  • 6 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 109,000 MILES
My son's car. It has gotten super cold here and it may be a coincidence, not sure. But the heat would just cut off while driving everything stops then comes back. But the main problem is that when you turn the speed dial too high it does not blow full power, so he can hear the blower change speed but the amount of air out of the vents is the same. Blower speed changes fine. Found this code.
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Sunday, January 21st, 2024 AT 3:03 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Okay, I would try replacing the sensor and then clear the codes. Also, when the heater stops working are both heater hoses going into the firewall hot. Make sure to check the coolant level. Please go over this guide and I have included the sensor location in the images below:

https://www.2carpros.com/articles/car-heater-not-working

It could be the air mix door is not working as well. Here is the location for that so you can check it out as well. Check out the images (below). Please let us know what happens.

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Monday, January 22nd, 2024 AT 11:43 AM
Tiny
BHAMDOC1973
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  • 1,656 POSTS
So, the sensor is behind the vents? The heat now comes out from the vents, son didn't pay attention to the button pressed to defrost.
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Monday, January 22nd, 2024 AT 12:14 PM
Tiny
KEN L
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It looks like the sensor is behind the glove box, so the heat works now?
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Tuesday, January 23rd, 2024 AT 10:11 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,656 POSTS
Yes, the heat works and comes out of the vents. Son not focused enough to realize the button was lit on feet and not vents, lol.
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Tuesday, January 23rd, 2024 AT 10:17 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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I happens, glad you got it fixed.
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Wednesday, January 24th, 2024 AT 9:39 AM

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