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2006 chevy trailblazer_ls
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2 Posts
I just replaced the mode actuator yesterday, and found the write-up "Replacing HVAC Mode Acuator" on the TrailblazerSSforum to be extremely helpful, especially the pictures of how the two gears fit together. I'd post a link, but I don't have 5 posts here yet.
 

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2002 gmc envoy_slt
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10 Posts
Just completed mode door actuator replacement

Thanks to the knowledge shared in this thread, I felt pretty confident going in. Job was pretty straight forward & went smoothly. It helps if you are not in a hurry and can get yourself off the floor of the vehicle to stretch once and a while!

The actuator was firmly on the mode door shaft and I was reluctant to lever too much on it for fear of bending or breaking the shaft. I ended up fabricating a tool from some 1 1/2 square tube I had in the garage... made the removal really easy.

I also pulled the old actuator apart and couldn't see any visible failure... I presume the motor or cicuit board failed.
 

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I had a problem last week with my drivers side only blowing out hot air. I went and replaced the driver's side blend door actuator and now it goes from hot and cold when the dial is turned.

However I can't get the air to vent on the floor when it's selected. When I select floor it blows out by the windshield. The defrost/windshield and vent only work but not the floor. Is that an actuator issue? I see two other actuators above the gas pedal and I see one moving when I select the different modes.
 

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2003 chevy trailblazer_ltz
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2 Posts
Are the actuators different from each other?

Are each of the actuators different? Or can i buy multiple ones and use it to change each one in my 03 Chevy Trailblazer?
 

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I replaced the actuator but still doesn’t move through modes , now instead of it being stuck on floor it’s currently stuck on the face vents
 

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2005 chevy trailblazer_lt
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3 Posts
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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2005 chevy trailblazer_lt
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3 Posts
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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15 Posts
I am installing as actuator and it seems like during the install it wanted to go in with the door closed , is this right ?
The actuator gear does not move and I was wondering if this is middle or the close point , Please help I want to get this completed.
HVAC Heater Blend Door Actuator on a 2004 envoy
 

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Hi newer owner of an 02 Olds Bravada here. My HVAC is stuck on defrost, but can also blow out of the dash if I desire. Dual zone temperature controls still work but I have only the faintest breeze on my feet. Following this forums advice I tried resetting the hvac fuse, no luck, and I just put a new mode actuator in, still no luck. I may be too late to this party but if anyone can help me you guys can. SOS!
 

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2004 chevy trailblazer_lt
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35 Posts
Hi newer owner of an 02 Olds Bravada here. My HVAC is stuck on defrost, but can also blow out of the dash if I desire. Dual zone temperature controls still work but I have only the faintest breeze on my feet. Following this forums advice I tried resetting the hvac fuse, no luck, and I just put a new mode actuator in, still no luck. I may be too late to this party but if anyone can help me you guys can. SOS!
Did you try the reset again, and perform the recalibration procedure, after replacing the actuator?
That seems like it would be my next step. I have the same issue, I just haven’t got around to fixing it.


Sent from my iPhone using Tapatalk
 

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2004 chevy trailblazer_lt
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35 Posts
Hi newer owner of an 02 Olds Bravada here. My HVAC is stuck on defrost, but can also blow out of the dash if I desire. Dual zone temperature controls still work but I have only the faintest breeze on my feet. Following this forums advice I tried resetting the hvac fuse, no luck, and I just put a new mode actuator in, still no luck. I may be too late to this party but if anyone can help me you guys can. SOS!
Did you replace the correct actuator?


Sent from my iPhone using Tapatalk
 
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