2025 Blend door issue? - SOLVED

[Stbentoak]

Back in cooler weather now and when I set the driver on 70 and passenger on 80, the pass side blows ice cold (Outside?) air even though it is set on 80, both at the foot well and vent besides the big screen.
Most likely faulty blend door actuator? I'm sure it's under warranty. Wifey is freezing!

 

[OR VietVet]

Back in cooler weather now and when I set the driver on 70 and passenger on 80, the pass side blows ice cold (Outside?) air even though it is set on 80, both at the foot well and vent besides the big screen.
Most likely faulty blend door actuator? I'm sure it's under warranty. Wifey is freezing!

It will be a reset.

 

[Blueinterceptor]

What do you mean a reset? I have the same issue. Was told they may have to change the blend door actuator.

 

[OR VietVet]

Update thru the module and equipment or parts replacement. I keep talking about the new ones are "lacking in reliability".

 

[jerry455]

Yeah, no has ever had to change a blend door motor on a GMT 800, LOL. Pretty common.

 

[OR VietVet]

Yeah, no has ever had to change a blend door motor on a GMT 800, LOL. Pretty common.

Not on one that is "ONE" year old.

 

[Joseph Garcia]

What do you mean a reset? I have the same issue. Was told they may have to change the blend door actuator.

A 'reset' is a procedure using a quality bi-directional scanner to re-learn a blender door's proper positions associated with each setting in the HVAC system.

Sometimes, these settings go whacky for several different reasons. The first step is to perform a re-learn procedure, to see if the issue is associated with the electronic settings and learned positions for the blender door actuator. Associated with this procedure, you can also test the blender door actuator operation at various operating positions to confirm its intended movements for various HVAC system settings. If the reset procedure is successful, you are good to go. If it is not successful, then you most likely have a mechanical issue with the blender door actuator operation, and the blender door actuator may need to be repaired or replaced.

 

[Fless]

A 'reset' is a procedure using a quality bi-directional scanner to re-learn a blender door's proper positions associated with each setting in the HVAC system.

Sometimes, these settings go whacky for several different reasons. The first step is to perform a re-learn procedure, to see if the issue is associated with the electronic settings and learned positions for the blender door actuator. Associated with this procedure, you can also test the blender door actuator operation at various operating positions to confirm its intended movements for various HVAC system settings. If the reset procedure is successful, you are good to go. If it is not successful, then you most likely have a mechanical issue with the blender door actuator operation, and the blender door actuator may need to be repaired or replaced.

^^^ This. Great info.

 

[Johnny Fr]

This is a known defect on 2025-26’s. We discovered it last October but didn’t do anything since no parts. We finally got it fixed 2 weeks ago. Dealer had our Tahoe 2 weeks as the entire dash comes out, coolant drained, AC evacuated. Upper evap case gets replaced. Here’s a link to the bulletin.

https://static.oemdtc.com/NHTSA-PDFs/MC-11028703-0001.pdf

 

[Stbentoak]

This is a known defect on 2025-26’s. We discovered it last October but didn’t do anything since no parts. We finally got it fixed 2 weeks ago. Dealer had our Tahoe 2 weeks as the entire dash comes out, coolant drained, AC evacuated. Upper evap case gets replaced. Here’s a link to the bulletin.

https://static.oemdtc.com/NHTSA-PDFs/MC-11028703-0001.pdf

Holy crap, I'm not sure I want them tearing my dash apart that much..... but I'm sure they'll probably have to. This definitely describes my problem and probably is it. I need to really figure out if my local dealer is up for this or not. Not a huge dealer. If he doesn't exude confidence..... I may have to take it back to the big city dealer I bought it from three hours away.

 

[OR VietVet]

GMT800's lookin' pretty good right now.

 

[Blueinterceptor]

GMT800's lookin' pretty good right now.

Not very nice

 

[CMoore711]

Holy crap, I'm not sure I want them tearing my dash apart that much..... but I'm sure they'll probably have to. This definitely describes my problem and probably is it. I need to really figure out if my local dealer is up for this or not. Not a huge dealer. If he doesn't exude confidence..... I may have to take it back to the big city dealer I bought it from three hours away.

Your concerns on the extent of the work and dealer service capability are valid. This type of disassembly can have irreversible side affects on the long term fit, finish, NVH (Noose Vibration Harshness) of the interior.

There are so many plastic clips fasteners and hardware keeping these plastic parts together correctly. A couple broken clips and tabs and all of a sudden the interior on your “one year” old rig now has new noises, creaks, and vibrations. Unfortunately, some of the noises, creeks, and vibrations may not show their ugly face immediately after the work is done, but instead miles later after things have had a chance to “loosened up” due to the lack of a broken clip/tab. And by that time do you think any dealer service department is going to take accountability for it? No….

Do you think any dealer service tech is going to fess up; “Hey I broke this clip/tab during disassembling the dash to perform this known issue repair service bulletin. We should probably get a new one of these parts before reassembly.” Said no service tech ever…

 

[Joseph Garcia]

Holy crap, I'm not sure I want them tearing my dash apart that much..... but I'm sure they'll probably have to. This definitely describes my problem and probably is it. I need to really figure out if my local dealer is up for this or not. Not a huge dealer. If he doesn't exude confidence..... I may have to take it back to the big city dealer I bought it from three hours away.

Yes, I think that you should definitely assess the dealer's repair capabilities, before turning your truck over to them.

 

[OR VietVet]

So....you get the dealer to cover the repair and because you expect problems later, you trade it in and take a loss on the difference or buy a worthless extended warranty that will not cover noises. IMO, as soon as all these creature comforts were added, it makes it that much harder to deal with an actually needed component, like the actuator. I do feel bad for you about this. I saw it all coming when I was in the shops. I knew I was gonna own a GM product and the GMT800 has it's own faults but way easier to deal with. Good luck.

 

[marktrafton]

Not on one that is "ONE" year old.

Do you have any facts that support your statement that “Not on one that is “ONE” year old?

 

[marktrafton]

Not very nice

I totally agree.

 

[OR VietVet]

Do you have any facts that support your statement that “Not on one that is “ONE” year old?

Do a search for "actuator" and then go to 2009 posts and see if you see ANY actuator posts. Your 2025 is not the first one I have seen here with problems, right out of the box. Hence the above post by @Johnny Fr.

I totally agree.

Short and to the point responses and attempts to be a smart ass by me, does not mean I am not nice. It means someone has thin skin.

Take the comment in jest, as it is meant. C'mon man!

Plus, I play the age card all the time. Us 73 year old men and women can get away with that. It's in the "BOOK".

 

[Blueinterceptor]

Your concerns on the extent of the work and dealer service capability are valid. This type of disassembly can have irreversible side affects on the long term fit, finish, NVH (Noose Vibration Harshness) of the interior.

There are so many plastic clips fasteners and hardware keeping these plastic parts together correctly. A couple broken clips and tabs and all of a sudden the interior on your “one year” old rig now has new noises, creaks, and vibrations. Unfortunately, some of the noises, creeks, and vibrations may not show their ugly face immediately after the work is done, but instead miles later after things have had a chance to “loosened up” due to the lack of a broken clip/tab. And by that time do you think any dealer service department is going to take accountability for it? No….

Do you think any dealer service tech is going to fess up; “Hey I broke this clip/tab during disassembling the dash to perform this known issue repair service bulletin. We should probably get a new one of these parts before reassembly.” Said no service tech ever…

This is my biggest fear

 

[Johnny Fr]

Having had the repair done, we honestly couldn't really find any faults with the job. For example, I thought what if the screens are all scratched or dinged? They were not.

The only thing I could find is a tool mark to the lower left of the steering column. It's so small nobody will ever see it. Then, the area of the steering column that is covered only by fabric (this is uber cheap, is a Caddy like that?), there seems to be a tiny staple. Was that there before? Dunno. But don't see anything broken nor rattles. The alternative is to have no heat, which isn't a good one lol Nobody wants this job done on a new vehicle. My lil bro's office, a woman got a new Escalade V. I told him to tell her to check her heat. But he doesn't want to. Imagine finding out the first week you have no heat, not good but it's reality...I say get the repair done, and don't obsess. Do take multiple and panoramic pics of the dash just in case...but they must do so many of these they're used to them by now...