Heater core prob. and Overheating - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-20-2008, 04:01 PM   #21
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I think it was running after that day I didn't see a leak any more after all the times my face has been on the passenger side of that engine.
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Old 01-20-2008, 04:05 PM   #22
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If you saw the water pump leaking, you will need to replace it. It will not heal itself or get better.

I used the search feature at the top of the page under key words "heater core" and found this:

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Originally Posted by bill buttermore
Here'* is a little bit of information that should save you about 8 hours.

Quote:
Originally Posted by RMac
.....As far as fixing the door - don't see how it can go bad it is only flat piece of plastic with has a lever to move, unless you break off the lever there should be no problem.

As for needing to remove center console and dropping dash to repair - Not necessary.
I have 95 SSEi and just did the core - forget the GM manual for help. It is tight to change the heater core but only need to remove HVAC controller, Air Mix Motor and Cover for core and two hose clamps from engine compartment side. Pull rug and padding back for some clearance......





Hope this helps.
Quote:
Originally Posted by bill buttermore
A cable tool like the one shown on the right below makes quick work for clamps in tight spots.



This one is a Mayhew - costs about $65 from the Mac tool man.
You really have to have a cable clamp tool or you'll spend all day on those &$#*( clamps.
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Old 01-20-2008, 04:31 PM   #23
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ok thanks, it'* 10 degrees out here which makes it kind of hard.
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Old 01-20-2008, 04:38 PM   #24
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come to think about it, my ECC use to flash everytime my car started I had a post about it. then eventually it stopped after resetting my pcm. So, would I need to replace the air mix valve (door)
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Old 01-21-2008, 03:02 AM   #25
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Quote:
Originally Posted by trigga_b
come to think about it, my ECC use to flash everytime my car started I had a post about it. then eventually it stopped after resetting my pcm. So, would I need to replace the air mix valve (door)
I didn't mean that you need to replace the air-mix door with that post; just wanted you to know that others have changed out the heater core without removing the dash, and to give you an idea of who to search for to learn more.
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Old 01-21-2008, 01:05 PM   #26
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thanks for the help, I'm half way through with it now. the job seems like its only going to total up to 2 hours max in labor.
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