Heater not working on drivers' side?

Tiny
JOHN ERVIN2
  • MEMBER
  • 1995 CADILLAC DEVILLE
  • 4.9L
  • V8
  • AUTOMATIC
  • 132,457 MILES
I get heat only on a passenger side driver side blows cold air.
Tuesday, December 20th, 2022 AT 4:30 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

On most vehicles, this would indicate a faulty blend air door/air mixt actuator-related issue. However, and correct me if I'm wrong, this vehicle doesn't have dual climate control.

Instead, the air temperature entering the vehicle is controlled by a programmer which receives your request and then adjusts the temp as requested.

What I suspect is the controller isn't fully operational. So, here is what I suggest: Confirm the controller is responding correctly and isn't failing.

Take a look at the pics below. I provided the diagnostics related to the air temp programmer. Take a look through them and let me know if you are comfortable performing them.

Let me know.

Joe

See pics below.
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Tuesday, December 20th, 2022 AT 6:41 PM
Tiny
JOHN ERVIN2
  • MEMBER
  • 1 POST
Yes I will try.
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Wednesday, December 21st, 2022 AT 10:04 AM

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