Switching from front vent, defroster, feet, does not correspond?

Tiny
SIXTY6GTO
  • MEMBER
  • 2015 LEXUS IS 250
  • 2.5L
  • 2WD
  • AUTOMATIC
  • 117,700 MILES
The air conditioning works but switching from front vent, defroster, feet, etc does not correspond with the input to the controls. Also this problem does not allow full control of the temperatures. Is there a blend door? Is there something else? What are common problems and items to check first? I attached a picture of the type of controls on this vehicle.
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Saturday, January 10th, 2026 AT 9:15 PM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,420 POSTS
Yep, this happens when the air mix actuator goes out which is common, here is the location and calibration instructions have the replacement. Here is how to rest the system once the repair are made

https://www.2carpros.com/articles/step-by-step-guide-to-reset-your-cars-hvac-system-an-essential-for-every

Check out the images (below). Please upload an image or a short video in your response. Ken
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Sunday, January 11th, 2026 AT 11:02 AM
Tiny
SIXTY6GTO
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  • 109 POSTS
Any chance there are service manual written procedures and video to change the air outlet control servo and the air mix control servo specifically on this make model? That would be much appreciated.
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Sunday, January 11th, 2026 AT 1:32 PM
Tiny
KEN L
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This is all we have, they don't give us step by step for some reason on this repair. Sorry. If you upload images for what you are doing to can help guide you through the repair.
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Monday, January 12th, 2026 AT 11:30 AM
Tiny
SIXTY6GTO
  • MEMBER
  • 109 POSTS
How to access the air mix control servo motor? I'm having a hard time to try and understand where its located and how to access it.
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Wednesday, March 4th, 2026 AT 8:20 PM
Tiny
SIXTY6GTO
  • MEMBER
  • 109 POSTS
I noticed that the modes are not corresponding as well. The face, feet, defrost etc does not correlate to the selection buttons. Mode servo?
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Wednesday, March 4th, 2026 AT 8:29 PM
Tiny
KEN L
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Yep, mode servo, it is located right above the accelerator pedal. Use a flash light so you can get at it, also remove the lower dash panel on the drivers side.
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Thursday, March 5th, 2026 AT 8:44 AM
Tiny
SIXTY6GTO
  • MEMBER
  • 109 POSTS
There are two control servo motors in the picture. Can you explain the purpose of each of them? Since I know I definitely have a problem with the location of the air coming out of a different vent than selected, I should try to change that first.

The one with the red arrow is the air mix control servo motor, and what does that do? Also, the other one, the air outlet control servo motor pictured above it, what does that do?
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Friday, March 6th, 2026 AT 7:51 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,420 POSTS
Yep, so the air mix is for the temperature and the outlet is for the vent control, ie: floor, mid and defrost.
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Friday, March 6th, 2026 AT 8:41 AM

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