HVAC Mode Actuator door replacement - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > The 02-09 "How-To" and DIY Section

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  #1  
Old 04-12-2008, 01:47 PM
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03Huggy 03Huggy is offline
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HVAC Mode Actuator door replacement

I just replaced my mode actuator due to the dash vents not working; it wasn't too bad of a job; you just need to be patient and smart as you work.

First you need to find out what part number to order; just call the local GM dealer. you will need to give them your VIN; the P/N I used was 89018675 and I got it from www.parts4chevys.com for $46.33 which was alot cheaper than the dealership.

Remove lower dash covers. The actuator is located behind the middle portion of the dash; if you lay on the floor and look to the left you will see it.

Remove gray air duct as shown in pc #53; just pull it from it's endpoint; this way you can get to the actuator better.

There's 2 actuators; you want the one with the white gear coming out the side; it's the lower one in pic #52. You will need a 5.5mm socket to get the 2 screws out; be careful not to drop the screws; take your time.

Pic #46 shows the actuator; the two horizontal holes are where the screws mount; the other one close to the wire connection has a dowel that helps locate the actuator. You will need to adjust the white gear shown in pic #46
to be at the same location as the gear on the actuator you removed in order for it to go back in correctly. There are 3 marks on the back of the plastic housing (as seen in pic #46) and also slots in the metal part of the gear drive, the top slot is in the 1'oclock position in pic #46. Be sure your new actuator gear position matches the old and it will drop right in. I put the screws in the socket and then wrapped electrical tape around them so the screw wouldn't fall out during assembly. The whole thing took me 45 minutes.
The vents now work like a charm and I saved a bunch of coin!

You can doooo eeeet!
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  #2  
Old 04-12-2008, 08:12 PM
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Quote:
Originally Posted by 03Huggy View Post
I put the screws in the socket and then wrapped electrical tape around them so the screw wouldn't fall out during assembly
Great write up! This is one of my favorite tips too
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  #3  
Old 05-09-2008, 12:49 PM
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Where is the world do you find a 5.5mm socket ?
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  #4  
Old 05-09-2008, 01:14 PM
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[QUOTE=03Huggy;535686] the P/N I used was 89018675 and I got it from www.parts4chevys.com for $46.33 which was alot cheaper than the dealership.[QUOTE]

GMPartsdirect.com GM LIST: $66.12 OUR PRICE: $34.38
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  #5  
Old 06-14-2008, 08:30 PM
waltkivbulk waltkivbulk is offline
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Lay on floor and look to left ---- From Driver or passenger side?
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  #6  
Old 06-15-2008, 01:26 AM
stanley2 stanley2 is offline
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Driver side looking to the center console; to the left.
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Old 06-15-2008, 05:42 PM
EXT 03 EXT EXT 03 EXT is offline
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When the motor goes bad does it cause a clicking sound?
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Old 06-15-2008, 11:17 PM
stanley2 stanley2 is offline
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Yes mine did a soft clicking.
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  #9  
Old 06-16-2008, 09:30 AM
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03Huggy, what prompted you to replace the Actuator? Currently my wifes '02 Envoy makes a clicking sound when you changes modes, like from the upper vents to the lower vents, etc. The air still comes out, but it makes the clicking noise like it is binding as it is changing positions. I didn't know if this is what you were experiencing or not?
Thanks
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  #10  
Old 06-16-2008, 10:07 AM
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5.5mm socket

Quote:
Originally Posted by LeonPhelps View Post
Where is the world do you find a 5.5mm socket ?
comparable to a 7/32" standard.
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