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

Maybe my heater core?

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Old Apr 12, 2010 | 01:55 AM
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Default Maybe my heater core?

So, for a few days I smelled coolant in the cockpit, but not the engine bay of my '88 coupe - 56k miles. My windshield fogged over, and a fellow Corvette friend told me my heater core. Problem is, I've been reading, and I haven't seen or felt a single drop of coolant in the passenger bay. The past few days I haven't really smelled the coolant, and the window isn't really fogging. Could it still be the heater core?
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Old Apr 12, 2010 | 06:53 AM
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Yes, examine the carpet under the heater core.
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Old Apr 12, 2010 | 07:30 AM
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The smell and the window fog are the 2 things that showed up on mine, if your lucky the wet floor will never happen because you will have changed it out before that .....Good Luck...WW
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Old Apr 12, 2010 | 09:01 AM
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That heater core won't heal itself. You can bet it's leaking or will leak. Feel the carpet on the right side. Press a paper towel into it. The antifreeze will show up. It is a tough job to replace the heater core. I spent most of Sunday just getting to mine. Mostly requires patience and small hands. Neither of which I have. I let mine go and I now have to replace the carpet too. Good luck!
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Old Apr 12, 2010 | 10:03 AM
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GM was kind enough to put foam on the backside of footwell panel. It can hold a lot, until it starts to drip on carpet.

Pull the panel and have a look.
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Old Apr 12, 2010 | 02:40 PM
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Don't debate the issue. The symptoms you have described are a heater core. Set aside a weekend and make the swap.

And yes you do have to pull the dash.
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Old Apr 12, 2010 | 04:37 PM
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Originally Posted by CaminoSS
Don't debate the issue. The symptoms you have described are a heater core. Set aside a weekend and make the swap.

And yes you do have to pull the dash.
If you do the (Fast Guy Method) which is what a lot of the guys on here use you don't have to pull the dash, just the passenger seat.. I believe the dash pulling starts on the 1990 and newer cars. The earlier years up to 1989 are a lot easlier to do.....Good Luck..WW
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