03 Envoy - Heater Core 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 > 02-09 General Tech Q&A > General

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  #1  
Old 01-10-2007, 05:43 PM
mb73 mb73 is offline
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2003 GMC Envoy SLE
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03 Envoy - Heater Core Replacement

Has anyone had to replace a heater core on a TB/Envoy yet?

I have a nasty coolant smell and moisture (on the windshield and side glass) coming out of right side defroster and dash vents. There is a fair amount of coolant in the foam insulation for the heater core and A/C lines in the passenger side footwell but no wet carpet.

The Haynes manual shows a very involved repair including removing the dash, instrument panel and steering wheel(!) and my GMC dealer wants $925 plus tax!

Do the engineers who design this stuff ever think that someone may actually have to repair it someday?!

Any feedback would be appreciated and thanks.
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  #2  
Old 01-10-2007, 06:36 PM
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rbarrios rbarrios is offline
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i was thinking about this myself yesterday.
though I dont have a leak.... if I did, I would prob do what I did on my 1970. disconnect hose and leave it as is....
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  #3  
Old 01-11-2007, 07:34 AM
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RozmerJJ RozmerJJ is offline
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I have never done one on a TB or Envoy but I have replaced more than my fair share of cores on other vehicles. This is a VERY involved task and unless you feel very comfortable ripping the entire front of your interior apart I would suggest it is money well spent to have someone else do it.
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  #4  
Old 03-24-2011, 10:31 AM
02AvalancheKid 02AvalancheKid is offline
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Heater core replacement pics

Done it last weekend took me and my son about 12 hours, was fun for us but we crazy , very tough job, was our first time, here r some pics...http://gallery.trailvoy.com/showgall...0/ppuser/86957
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Old 03-24-2011, 10:36 AM
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As the saying goes, when they assemble a vehicle on the production line, they first put the heater core on a pedestal and then every other component hangs onto that.

If they REALLY wanted to, they could design it to be replaced easily. But then how would the dealer network survive. I'm convinced it's a GM (or any manufacturer's) management decision to throw a bone to the dealers for long-term support revenue.
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  #6  
Old 03-24-2011, 10:37 AM
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Awesome Pictures!! Thanks!!
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  #7  
Old 03-24-2011, 10:47 AM
Loverotties Loverotties is offline
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Quote:
Originally Posted by 02AvalancheKid View Post
Done it last weekend took me and my son about 12 hours, was fun for us but we crazy , very tough job, was our first time, here r some pics...http://gallery.trailvoy.com/showgall...0/ppuser/86957
OMG!I give you thumbs up!how many extra screws and nuts did you have left over?
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  #8  
Old 03-24-2011, 10:53 AM
02AvalancheKid 02AvalancheKid is offline
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heater core replacement

Got more detailed pics, took 100 pics of every bolt and plug uploaded to comp. to insure all screws and wires got back where they need to go.a little common sense and the right tools you can do this job. My wife had her doubts when she came home and seen it stripped..lol we just laughted and told her she might have to get a new truck ..lol did have 4 screws left over but saved 900 bucks and they probally woulda left out more than that.. just uploaded a few more pics..http://gallery.trailvoy.com/showgall...0/ppuser/86957
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  #9  
Old 03-24-2011, 11:29 AM
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the roadie the roadie is offline
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Quote:
Originally Posted by 02AvalancheKid View Post
...did have 4 screws left over ...
As the joke goes, if you take something apart and put it back together enough times, sooner or later you'll have enough parts to make TWO of 'em!
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  #10  
Old 02-08-2012, 01:21 AM
brademan76 brademan76 is offline
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2002 Chevy TrailBlazer LTZ
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Glad to see this can be done! Thanks for posting the pics. I've ordered the repair manual I saw in your pictures and plan on doing this when it warms up a bit!
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