C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Bad heater core???

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Old Jul 31, 2001 | 01:00 PM
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After reaching normal operating temps, my 91 is pouring a fog/mist from the heating/cooling vents. I'm pretty sure it's coolant. Sound like a leaking heater core to you guys? If so, how big of a bear is it to tackle yourself? Yes. I've stopped driving the car. I don't think it's too healthy to breathe in anti-freeze.

Thanks for any help you can be.

Art

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Old Jul 31, 2001 | 02:47 PM
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Sounds like it could be the core, does your windshield fog up as well? Also check the carpeting on the passenger side near the firewall, if it is wet your core is leaking. I replaced the one in my 85 and took about 4-5 hours, you need a lot of patience and being a contortionist helps , it is doable though. Good luck...Jeff

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Old Jul 31, 2001 | 03:06 PM
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Originally Posted by inverted99
Sounds like it could be the core, does your windshield fog up as well? Also check the carpeting on the passenger side near the firewall, if it is wet your core is leaking.
[/color]
Thanks for the response, Jeff!
Yes to both. I guess I have some work cut out for me this weekend. Any gotcha's I should look out for?

Thanks!
Art
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Old Jul 31, 2001 | 03:27 PM
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:[/color]<HR><font face="Verdana, Arial" size="2">Any gotcha's I should look out for?[/color][/QUOTE]

The only thing that was really troublesome was the Instrument Panel brace that runs at about a 45 degree angle and attaches behind the kick-panel. The bolt up under the dash for it is a real bear to put back in, also make sure your heater control cable stays adjusted correctly. Other wise the slide for the temperature control will not go all the way to the left. Yours is probably different though, if the 91 is electronic temperature control. Anyway, good luck man I know what you are going through...Jeff
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Old Jul 31, 2001 | 03:40 PM
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Thanks for all the good advise Jeff!

Art


Originally Posted by inverted99
The only thing that was really troublesome was the Instrument Panel brace that runs at about a 45 degree angle and attaches behind the kick-panel. The bolt up under the dash for it is a real bear to put back in, also make sure your heater control cable stays adjusted correctly. Other wise the slide for the temperature control will not go all the way to the left. Yours is probably different though, if the 91 is electronic temperature control. Anyway, good luck man I know what you are going through...Jeff[/color]
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Old Jul 31, 2001 | 07:27 PM
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My 85's blew in about 10 degree weather. INSTANT ZERO VISIBILITY!!! P.I.A. because I was doing +/- 75 at the time.

Anyway, yes you can do it yourself, but it is a pain. I'm a little claustrophobic, and I was getting uneasy at times with my head stuck way up there, and the seat "funneling" the rest of you up under the dash. It's one of those jobs that refresh your memory of high school science class when you learned that you have no depth perception with seeing an object with only one eye.

Save some cash and do it yourself, but be very careful with the new one as you are installing it.........

Good luck,

Carl
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Old Jul 31, 2001 | 07:38 PM
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On a 94, you start dismantaling from the instrument panel on the drivers side and work your way over the the passenger side. You should check a shop manual before starting.

Good Luck,

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Old Jul 31, 2001 | 07:38 PM
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Originally Posted by cohocarl:
[B
Save some cash and do it yourself, but be very careful with the new one as you are installing it.........

Good luck,

Carl[/B][/color]
Thanks Carl! Yes. I think I'll do it myself. Called the dealer] $550.00 to do it.

Art
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Old Jul 31, 2001 | 11:12 PM
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I let the dealer do ours. Wasn't about to try this one on my own. Before ours went, we had the "smell" of anti-freeze. It wasn't really that bad. Made cleaning the windows impossible though. They always smeared. When it finally let go, my wife was driving it home from work. She thought that the car had caught on fire or something, as smoke (actually steam) was just pouring out the vents. Dealer actually managed to get it done in a day, and it was right the first time. :-) Not cheap though!!!!!

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Old Aug 1, 2001 | 03:07 AM
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If mine lets loose, I will be doing it myself. No money to pay people to do work that I can do myself. If only I could do the entire engine and tranny myself, that would be mighty helpful to my wallet! .

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Old Aug 1, 2001 | 07:21 AM
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Changing the core is a p.i.a but can be done in about 5 hours. Take your time and be patient.
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