AC/Heater box actuator issue

2002 CHEVROLET TAHOE
220,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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DANNYBOY5474
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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.
Oct 15, 2025 at 3:20 PM
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STRAILER
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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.
Oct 16, 2025 at 2:10 PM
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DANNYBOY5474
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Unfortunately, your site won't allow me to upload a video or photo. Any ideas which actuator?
Oct 16, 2025 at 4:06 PM
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STRAILER
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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?
Oct 17, 2025 at 5:46 PM
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DANNYBOY5474
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Tomorrow I'm going to climb under and see if it's the blend/mode door actuator making the noise.
Oct 18, 2025 at 5:13 PM
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STRAILER
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Is it ticking? if so this is most likely the blend door actuator, let me know.
Nov 4, 2025 at 12:15 PM
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DANNYBOY5474
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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
Nov 5, 2025 at 10:08 AM
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STRAILER
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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
Nov 6, 2025 at 8:54 AM
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DANNYBOY5474
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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.
Nov 9, 2025 at 3:20 PM
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STRAILER
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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.
Nov 10, 2025 at 9:06 AM