Passenger side heater blowing cold air?

Tiny
SIGQUID
  • MEMBER
  • 1998 BUICK PARK AVENUE
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 324,124 MILES
With heat on the driver side defrost, mid-level, and floor. Gives heat. But the passenger side stays very cold in those three levels and in the rear of the console it is cold too when the heater is on.
Sunday, October 9th, 2022 AT 4:53 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,124 POSTS
Hi,

It sounds like you have a faulty blend air door actuator. This actuator is what controls the temperature entering the passenger compartment. Since you have heat on the driver's side, we know the heater core is good. So, the actuator on the passenger side is my first suspect.

I attached the directions for replacing the actuator below. What I suggest is to remove it and while it is still connected, see if it responds when you change the temperature request on the passenger side. If it doesn't, it's either bad or there is no power to it. You can check for power using a test light.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Also, here is a link that explains how, in general, one is replaced. You may find it helpful as well.

https://www.2carpros.com/articles/replace-blend-door-motor

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.
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Sunday, October 9th, 2022 AT 7:02 PM

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