HVAC blend door actuator - 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 > 02-09 Appearance > Interior

Interior Interior

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  #1  
Old 12-06-2010, 01:01 PM
Summerwinterski Summerwinterski is offline
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2002 GMC Envoy SLT XL
Black 4.2L I6 AWD
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Location: York, PA
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HVAC blend door actuator

I replaced the blend door actuator for drivers side temp control. Long story short; the replacement one from an auto parts store didnt work at all so I moved the one from the defrost door to the temp control position and it worked. I got a new one from a dealer and put it in the location of the defrost damper. Now the defrost actuator goes fully thru the recalibration from one end to the other when power is restored but then goes to full defrost and stays there. So I know the actuator is functioning and the wiring to it is functioning. It worked fine before I started this project. Sounds like a programming issue. For now I pulled the plug on it during the calibration process when it was on about 3/4 floor and 1/4 defrost. Any ideas? At least I have heat now but I need to get the defrost working before the snow hits here. 2002 gmc envoy XL-SLT.
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  #2  
Old 12-06-2010, 01:55 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
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What were the part numbers for all the items you installed, and do any of them match this drawing I did a lot of research to put together?

Also, what brand and part number was the parts store one? I didn't know there are any sources other than AC Delco, which could come from a parts store.

[IMG]******************************************[/IMG]
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  #3  
Old 12-08-2010, 09:36 PM
Summerwinterski Summerwinterski is offline
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Thanks for the drawing. The auto parts store and the dealer did give me the wrong parts. I had the dealer order the correct part number (89018676)and I will pick it up on Saturday. They said they would take this one (89018677) back. A surprise to me was the dealer price of $66, compared to autoparts store price of $115. The part from the autoparts store is made by Dorman.

http://dormanautoparts.com/applicati...+DOOR+ACTUATOR

They gave me model 604-106 but should have given me 604-111. The autoparts stores books only seem to show one part number for these actuators.
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  #4  
Old 09-18-2011, 08:32 PM
flow flow is offline
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2002 Chevy TrailBlazer LS
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another actuator issue

I had the blend door actuator replaced on my 02 trailblazer. Part #89018539, only the front vents were not blowing at all. The replacement corrected the problem. However, 4 months later, now the driver's side blows hot air and the passenger side blows cold air. I noticed the part # I had replaced is not listed. I would take it back to the shop but I had it fixed in Arizona and now I have relocated to Georgia. Any ideas on which actuator to start with now?
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  #5  
Old 09-19-2011, 11:27 AM
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the roadie the roadie is offline
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Quote:
Originally Posted by flow View Post
...the driver's side blows hot air and the passenger side blows cold air. ...
One of the two temp actuators is dead, but it all depends on what temp air you're asking for. Whichever side is NOT giving you what you ask for is the bad one.
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  #6  
Old 09-30-2011, 11:48 PM
izzadaddy izzadaddy is offline
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2002 Chevy TrailBlazer LT
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need a how to

I'm trying to get the passenger side actuator out, I already have it loose but can't seem to get it past the metal brace.
My question is, what else has to come out to be able to replace this?
Thanks for any help in advance.
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  #7  
Old 10-01-2011, 12:25 PM
the roadie's Avatar
the roadie the roadie is offline
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People usually cut the brace.
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  #8  
Old 10-01-2011, 02:44 PM
izzadaddy izzadaddy is offline
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thanks

thanks roadie you always seem to have the answers I'm looking for. do you know what the brace is for? a friend of mine has a mdx that has a similar brace in front of the cabin filter the lube shop told him that they would cut it out to replace the filter and it would take an hour, don't know what kind of saw they are using but I told my friend to leave the filter for now b/c I saw that his was bolted in and could probably be removed and replaced in the same hour with no damage to something that was probably put there for a reason.

he agreed and said he thought it was odd that this person who doesn't look like he's been driving for any longer than half the aged of his truck was wanting to take an hour to cut out something so simple to get to.

anyway a little of topic but thanks for the help now, in the past and hopefully in the future.
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  #9  
Old 10-01-2011, 03:52 PM
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the roadie the roadie is offline
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It's typical structural stuff that may be of marginal use in a crash only.

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  #10  
Old 10-01-2011, 10:39 PM
izzadaddy izzadaddy is offline
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2002 Chevy TrailBlazer LT
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Quote:
Originally Posted by the roadie View Post
It's typical structural stuff that may be of marginal use in a crash only.
That looks like something that might maybe if you hold your tongue to the right and jaw to the left it could stop the passenger from being pinned between the seat and dash in a crash.


Thanks for the pic I feel better about cutting it out now.
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