No heat on passenger side?

MVANN74

MEMBER
2006 BUICK LUCERNE
3.8L
6 CYL
2WD
AUTOMATIC
123,865 MILES

I have the car listed above CXL 3.8. It has dual zone climate control. When I turn on the heat it's hot on the driver's side and cool on the passenger side. I've replaced the upper blend door actuator and the lower blend door actuator. Didn't solve the problem. What could be the issue?

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,960 POSTS

There are several actuators, so we need to make sure you replaced the correct one to solve the problem. If that's okay, I would disconnect the battery overnight to reset the system. Check out the images (below). Please let us know what happens.

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Wednesday, October 19th, 2022 AT 9:47 AM

MVANN74

MEMBER
65 POSTS

Replaced #5 and #7. Will try suggested reset. Will let you know what happens.

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Wednesday, October 19th, 2022 AT 12:14 PM

KEN L

MASTER CERTIFIED MECHANIC
42,960 POSTS

Sounds good, wish us luck!

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Thursday, October 20th, 2022 AT 11:18 AM

MVANN74

MEMBER
65 POSTS

Update: reset didn't work.
Ended up taking out dash and the whole HVAC unit. On the left side of the unit there are two hoses. On the bottom hose the air door gears were broken and the door was stuck. Replaced gears work fine now. It's was a whole day's work but after some curse words and a few scraped knuckles it gone done. Thank you for pointing me in the right direction. Without those diagrams you sent I wouldn't have been able to fix problem.

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Saturday, October 22nd, 2022 AT 9:47 AM

KEN L

MASTER CERTIFIED MECHANIC
42,960 POSTS

Nice work! We try to help the best we can over the internet, but it's people like you that make the repair happen that makes it rewarding for us. Use 2CarPros anytime, we are here to help. Please tell a friend.