AC/Heater box actuator issue

Tiny
DANNYBOY5474
  • MEMBER
  • 2002 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
I have an actuator that runs continuously regardless if system Is on. Hard to tell which actuator is making the sound, but my guess is something is broken or stripped making this actuator run ALL the time. Its like it cycles then reaches the end of travel, makes a CLICK sound, then starts over. I can make a video if needed.
Wednesday, October 15th, 2025 AT 3:20 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yes, a video will help, then you need to put you hand on the actuator to confirm which one is making the noise, please go over this guide which will help you with the repair.

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

Please upload an image or short videos in your response of the problem, so we can see what's going on.
Was this
answer
helpful?
Yes
No
Thursday, October 16th, 2025 AT 2:10 PM
Tiny
DANNYBOY5474
  • MEMBER
  • 39 POSTS
Unfortunately, your site won't allow me to upload a video or photo. Any ideas which actuator?
Was this
answer
helpful?
Yes
No
Thursday, October 16th, 2025 AT 4:06 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
You need to give the video time or do a shorter video, they are large files, it can be any of the actuators, did you look at the guide I sent?
Was this
answer
helpful?
Yes
No
Friday, October 17th, 2025 AT 5:46 PM
Tiny
DANNYBOY5474
  • MEMBER
  • 39 POSTS
Tomorrow I'm going to climb under and see if it's the blend/mode door actuator making the noise.
Was this
answer
helpful?
Yes
No
Saturday, October 18th, 2025 AT 5:13 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Is it ticking? If so this is most likely the blend door actuator, let me know.
Was this
answer
helpful?
Yes
No
Tuesday, November 4th, 2025 AT 12:15 PM
Tiny
DANNYBOY5474
  • MEMBER
  • 39 POSTS
It is in the center of the hvac box on the top. Do you have a diagram/location of the actuators in that location? Thanks
Was this
answer
helpful?
Yes
No
Wednesday, November 5th, 2025 AT 10:08 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Sure do, please scroll down

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

This video show the typical replacement, your location maybe different.

https://www.youtube.com/watch?v=Eqf-H3COtSo

Please upload an image or short videos in your response of the problem
Was this
answer
helpful?
Yes
No
Thursday, November 6th, 2025 AT 8:54 AM
Tiny
DANNYBOY5474
  • MEMBER
  • 39 POSTS
Hello Ken, Sorry I just crawled under and verified that the Blend Door Actuator ISN'T the one making noise. As I stated it's an actuator in the middle of the hvac box on top. Noise is from that area behind the glove box. Any ideas which actuator that one is? Thanks.
Was this
answer
helpful?
Yes
No
Sunday, November 9th, 2025 AT 3:20 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
It sounds like the mode actuator which is on top of the HVAC plenum. Please use the gauge above and scroll down to the bottom it shows the location of the actuator so you can double check if that is the one making noise. Please let us know what happens.
Was this
answer
helpful?
Yes
No
Monday, November 10th, 2025 AT 9:06 AM

Please login or register to post a reply.

Related Camshaft Actuator Content

VIEW MORE