Heater only stay on vent won’t transfer vents?

Tiny
KB1012021
  • MEMBER
  • 2015 CHEVROLET EQUINOX
  • 6 CYL
  • AUTOMATIC
  • 84,000 MILES
My heat and air works good but they only stay on vent won’t transfer to defroster
Saturday, November 22nd, 2025 AT 1:24 AM

7 Replies

Tiny
KRAKENAUTO
  • MECHANIC
  • 69 POSTS
A bad mode door actuator can cause the inability to change the airflow direction to different vents. Instructions below on how to get to it and replace it.

Remove instrument panel insulator panel - left side. Refer to Instrument Panel Insulator Panel Replacement - Left Side.
Remove the communication interface module. Refer to Communication Interface Module Replacement.
Reposition any wiring or hoses to gain access to mode control cam actuator.

Mode Control Cam Actuator
Procedure

Disconnect wiring connector at actuator.
Calibrate the mode control cam actuator.
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Saturday, November 22nd, 2025 AT 4:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
I agree with KRAKENAUTO, it does sound like a bad MODE blend door actuator. Please let us know what happens.
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Sunday, November 23rd, 2025 AT 9:39 AM
Tiny
KB1012021
  • MEMBER
  • 4 POSTS
Thank you
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Sunday, November 23rd, 2025 AT 10:29 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Please let us know what happens ;)
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Monday, November 24th, 2025 AT 9:36 AM
Tiny
KB1012021
  • MEMBER
  • 4 POSTS
Ok got a friend that’s gonna look at it over thanksgiving thank you
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Monday, November 24th, 2025 AT 10:08 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Sounds good, have a nice holiday!
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Tuesday, November 25th, 2025 AT 9:02 AM
Tiny
KB1012021
  • MEMBER
  • 4 POSTS
You too happy thanksgiving
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Tuesday, November 25th, 2025 AT 9:34 PM

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