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

coolant leak question

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Old Oct 13, 2004 | 05:24 PM
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87 rag's Avatar
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Default coolant leak question

I don't know for sure if I have a coolant leak but my low coolant light used to come on when the car was cold. Now it stays on.
Every once in a while I smell coolant while I'm driving. The other night I had the heat on and my front window was fogging up. The defrost wouldn't clear it, just kept getting worse. I had to rub it with a cloth to be able to see. A friend told me coolant leak will do that and another friend told me he had a heater core go and it did this.
Has anyone had similar symptoms? Where is the heater core and how hard of a swap is it?
Thank you.
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Old Oct 13, 2004 | 05:32 PM
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I just read a thread about changing my heater core.
sounds like a pain in the a..but, but do-able.
What about the Barr stop leak stuff? is it worth a try or am I just postponing the inevitable? Does that stuff work on heater cores?
Thanks
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Old Oct 13, 2004 | 06:31 PM
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You can try stop leak... some have had luck with it. You just add it to your coolant, and turn your heater on, it should circulate through that. Of course any coolant already in your heater will continue coming out of the vent...
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Old Oct 13, 2004 | 06:36 PM
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I've used a product called alumaseal for years. It works ok on small leaks in radiators and gaskets. Doesn't hurt to try. If it were me I'd be mentally preparing myself for replacing the heater core though in case it doesn't work well enough. You describe the symptoms of a heater core leak exactly which are (1) the smell, (2) fogging windows that gets worse with the defroster on, (3) wet carpet on the passenger side. Open the hood and look to where the heater hoses go to the fire wall. Those two brass tubes that the hoses hook to are part of the heater core. The rest of it looks like a miniature radiator and is on the other side of the fire wall.
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Old Oct 13, 2004 | 06:44 PM
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I used stop leak once on a heater core, it was not a corvette but heater cores quite similar. I could see the wet spot on the corner of the core. It worked fine and that was years ago. It has A/C and gets a little warm but still no leakey.t

It is my understanding that when most cars are a built the first thing they do is place the heater core on the floor and build the car around it ;-}
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Old Oct 13, 2004 | 07:15 PM
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Default

Originally Posted by 87 rag
I don't know for sure if I have a coolant leak but my low coolant light used to come on when the car was cold. Now it stays on.
Every once in a while I smell coolant while I'm driving. The other night I had the heat on and my front window was fogging up. The defrost wouldn't clear it, just kept getting worse. I had to rub it with a cloth to be able to see. A friend told me coolant leak will do that and another friend told me he had a heater core go and it did this.
Has anyone had similar symptoms? Where is the heater core and how hard of a swap is it?
Thank you.
Barrs stop leak has powdered pellets, I used them to stop a pretty good frezze out plug leak and they are doing the job several years later

Jack
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Old Oct 13, 2004 | 07:37 PM
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Originally Posted by roger-88-Z51
It is my understanding that when most cars are a built the first thing they do is place the heater core on the floor and build the car around it ;-}
On C4 Corvettes, definitely. Changing the heater core is the second toughest job, on a C4. A guy was going to tell me the toughest, but he committed suicide before he finished. Any form of leak stopper IS merely forestalling the inevitable, but it DOES, forestall it. I used Alumiseal, an aluminum powdered product. Another way to prevent the impending interior waterfall, is to remove the heater hoses at the firewall and connect them together, eliminating the heater core (and heat) from the circuit. Good luck, and...

RACE ON!!!
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Old Oct 13, 2004 | 10:04 PM
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Originally Posted by CFI-EFI
OnAnother way to prevent the impending interior waterfall, is to remove the heater hoses at the firewall and connect them together, eliminating the heater core (and heat) from the circuit. Good luck, and...

RACE ON!!!
I like that idea...
I'll probably do that when my heater core kicks the bucket...
After all, it's not like the car sees the winter and cold weather.
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Old Oct 13, 2004 | 10:21 PM
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I have had better luck with alumaseal then barsleak.
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Old Oct 14, 2004 | 04:11 AM
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Default It matters where you live....

I live is south Florida and could live my life here without a heater. In that case I would bypass it. If you live up north and you drive during the winter, you have to bite the bullit and replace the heater core. Good luck.
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Old Oct 14, 2004 | 06:33 AM
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I used Alumiseal years ago for a leak and actually sold the car two years later!
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Old Oct 14, 2004 | 09:41 AM
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Thanks guys, I'll try the alumiseal and see how I make out.
I only bought the car in the spring so who knows if this is the first time for it or if it has been an ongoing problem. I will prepare myself for the inevitable. I live in Canada and won't be driving the car in the winter but the spring and fall have some pretty chilly nights that require a heater. Not for me of course, but for the lady in the passenger seat.
Thanks again.
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