Hi,
It sounds like there is an issue with one of the blend air door actuators. However, I need to know something. You indicated the driver's side is hot, and the passenger's side is cold. Which of the two is working correctly? Let me know. Otherwise, I don't know which is causing the problem. LOL
Just to give you an idea of how an actuator is replaced, take a look through this link. It explains in general how one is replaced.
https://www.2carpros.com/articles/replace-blend-door-motor
I also will need to know if the vehicle has automatic or manual climate control.
Take care and I'll watch for your reply.
Joe
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Monday, November 29th, 2021 AT 6:06 PM