Cadillac Owners Forum banner

Driver's side heat not working.

1478 Views 11 Replies 4 Participants Last post by  Ranger
OK, I promise, last question fo rtonight.

It started getting a bit cold here in California so I turned on the heater for the first since I bought the car. It blows cold (outside) temp air out of the driver's side, but the passenger's side gets a little warm.

I'd checked the heat when I bought the car a few months ago and it was fine. I've read all the posts on this site. I can see the passenger side acctuator moving (behind the little panel in the glovebox). I can't find the driver's side acctuator.

When I put the heater to defrost for the windshield hot air blows out of the passenger's side of the vent on top of the dash, but nothing on the driver's.

I should note that when I pulled codes it showed B1340 (Air Mix Door One Movement Fault) and B1341 (Air Mix Door Two Movement Fault). What do they indicate exactly and when should I go looking for the problem.

Also, I saw a post about a guy who's heater core became clogged by BarsLeak Gold. I recently had my radiator flushed and I add the Bars Leak Gold Label powder based on recommendations from this site. Should I flush the heater core? If so, how?

Are there other things I should be checking.
1 - 5 of 12 Posts
I tried pushing it shut and guess what... still problems.

Thanks for all the great suggestions.

I took off the passenger side hush panel and found the acctuator for the driver's side. It did seem like it was a bit sticky, but I got it adjusted so it moved freely and properly when I ran the temp up and down. However, with the "auto" heat all the way up to 90 degrees the air coming out of the driver's floor vent is still only abut room temperature, not hot like what was coming out of the passenger's side.

I even took the arm off the acctuator so I could try closing the door by hand. I could hear the door shut and I pushed it closed. With the door open I rcvd cool air, with it shut it was a tad warmer, but still not hot like the passenger's side.

What should I try next? Does anyone have an exploded diagram of the heater box? Is there a way to open it up without remiving the dash?

See less See more
Why is changing the HVAC programmer so horrible?
How do I flush the heater core?
1998 Deville.

Jeez, I'm sorry Ranger. I thought I mentioned the make and model in my initial post, but I guess not, sorry.

It's a 1998 Deville.
1 - 5 of 12 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.