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

Mystery Coolant Leak

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Old Mar 30, 2003 | 09:49 AM
  #1  
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Default Mystery Coolant Leak

I own a '95 LT1 which that has developed a coolant leak that I am unable to locate. All the hoses are good, as well as the radiator. I have replace the radiator cap as well without sucess. It does appear to be coming from the water pump either as far as I can tell. In addtion, coolant is flowing into the fill tank (near the winshield) from the bottom hose, not the one from the overflow tank. Anyone got any ideas?
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Old Mar 30, 2003 | 09:56 AM
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Default Re: Mystery Coolant Leak (eighty_duece)

Welcome to the forum ----

How about some more symptoms. Are there any drips? Location? Quantity? Did you recently flush the system?

I was able to find a small leak by doing a pressure test on the system.

Let us know

Jim
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Old Mar 30, 2003 | 09:59 AM
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Default Re: Mystery Coolant Leak (eighty_duece)

.. It does appear to be coming from the water pump either as far as I can tell.
This must be typo.....I think you wanted to say that it does NOT appear........

Pressurizing the coolant system with a pump might help.
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Old Mar 30, 2003 | 10:03 AM
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Default Re: Mystery Coolant Leak (jimswhite92)

I did have the coolant system flushed last Sept. and it went inot storage late October. At that time there wasn't any leak. Looking under the car, the leak is a steady steam coming off the metal support frame right under the engine. Had a buddy take a look at it who is good with cars (though he likes dodge) and there is just not enough room to look around. We jacked the vette up to get a view from underneth, but no luck.
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Old Mar 30, 2003 | 10:04 AM
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Default Re: Mystery Coolant Leak (Oldman)

yep a typo
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Old Mar 30, 2003 | 10:07 AM
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Default Re: Mystery Coolant Leak (jimswhite92)

thanks for the tip on the pressure test. I may just take it to an engine repair shop down the road with a good reputation.

Trying to get it ready for sale. Closing on a house in 30 days. Got to get rid of the toy for now. :cry
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Old Mar 30, 2003 | 12:49 PM
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Default Re: Mystery Coolant Leak (eighty_duece)

I had a similar situation and it was water pump tp block gasket.
Also very hard to see but when I took water pump down, I was sure.
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Old Mar 30, 2003 | 01:21 PM
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Default Re: Mystery Coolant Leak (Sliding)

Thanks, thought it may have been the water pump, but we could find anything from the front side. Cant get a good look at the back end. I'll have to get dirty next weekend and take a look. Got pretty cold this weekend. Had snow on the ground this morning. I thought winter was over here in Michigan.
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Old Mar 31, 2003 | 10:27 AM
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Default Re: Mystery Coolant Leak (eighty_duece)

My 90 convertible was doing the same thing last year. It turned ou to be the water pump. It didn't leak all of the time, a pressure check showed everything ok. It usually leaked after the car was shut off and was cooling down.
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Old Mar 31, 2003 | 11:13 AM
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Default Re: Mystery Coolant Leak (Pats90)

Check the back of the heads where the intake is attached. The intake gasket may be leaking.
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Old Mar 31, 2003 | 02:53 PM
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Default Re: Mystery Coolant Leak (eighty_duece)

Had same problem on my 86,did pressure test & found water pump housing casket was the problem.
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Old Mar 31, 2003 | 05:26 PM
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Default Re: Mystery Coolant Leak (eighty_duece)

check the surge tank on the firewall, too. mine went bad... and it leaks where the brass collar joins the plastic tank.
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Old Mar 31, 2003 | 08:16 PM
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Default Re: Mystery Coolant Leak (bogus)

Thanks all for the tips, I'll let you know what I find.
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