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HVAC Mode Actuator door replacement - Trailblazer

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Old 02-09-2008, 11:10 PM   #1
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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.

1st 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

You will now start the by removing the 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 pic below; just pull it from it's endpoint; this way you can get to the actuator better.

There are 2 actuators; you want the one with the white gear coming out the side; it's the lower one in the pic below. You will need a 5.5mm or 7/32" standard socket to get the 2 screws out; be careful not to drop the screws.

The pic below 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 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 and also slots in the metal part of the gear drive, the top slot is in the 1'oclock position. 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!

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