Low air volume on defrost

LJSCHNEIDER

MEMBER
2008 CADILLAC ESCALADE EXT
160,000 MILES

Saturday, November 8th, 2025 AT 2:22 AM

7 Replies

LJSCHNEIDER

MEMBER
4 POSTS

I have installed new both HVAC Blower Motor and Blower Motor Resistor. I suspect Mode Door Actuator.

Was this

answer

helpful?

Yes

Sunday, November 9th, 2025 AT 1:47 AM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Yep, you would be correct, is the mode blend door actuator is weak or the gears inside broken the door will not close completely. Here is a guide to show you where the mode actuator is, scroll down to the bottom of this guide for more information.

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

Please a short video in your response of the problem, so we can see what's going on.

Was this

answer

helpful?

Yes

Sunday, November 9th, 2025 AT 10:44 AM

LJSCHNEIDER

MEMBER
4 POSTS

Ken, I'm a bit confused! The link you sent me "Replace a HVAC Air Blend Door Actuator with Calibration" seems to be f

Was this

answer

helpful?

Yes

Sunday, November 9th, 2025 AT 11:23 AM

LJSCHNEIDER

MEMBER
4 POSTS

Sorry, hit the wrong button.

I'm a bit confused! The link you sent me "Replace a HVAC Air Blend Door Actuator with Calibration" seems to be for the Blend Door Actuator and not the Mode Door Actuator. Do you have a Video for the Mode Door Actuator Install? If not, I believe it is located above the accelerator. Am I correct!

Larry

Was this

answer

helpful?

Yes

Sunday, November 9th, 2025 AT 11:31 AM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Hi Larry,

Yes, that is the correct guide, scroll down to see the location of the mode actuator for the HVAC system. This will be the one you need to change out. Please let us know what happens.

Was this

answer

helpful?

Yes

Monday, November 10th, 2025 AT 9:01 AM

LJSCHNEIDER