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big coolant leak can't see from where?!

This is a discussion on big coolant leak can't see from where?! within the GTO forums, part of the Vehicle Specific category; Went to the bank (5 min drive) about an hour ago, on the way home cruising around 40 mph i ...

  1. #1
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    Torrid Red
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    Exclamation big coolant leak can't see from where?!

    Went to the bank (5 min drive) about an hour ago, on the way home cruising around 40 mph i smell coolant coming thru the vents, 10 seconds later the "Low Coolant" alert flashes-got it home (only 1 mile, temp gauge stayed put) to see dex-cool leaking from the left, middle and right side of the front bumper. Water pump and thermo look fine, but there's coolant splashed in the battery tray, some on the pass. side manifold and hoses etc....what happened?!

    Front of car (I'd already started cleaning it but you can see where its wet on both sides, and since then its started dripping in the middle too)





    You can't really see in the 2nd pic but theres antifreeze on the a/c compressor, a/c hoses, back of the radiator, battery tray etc.....

    edit: The reservoir is completely drained to the bottom....I'm gonna crawl under and see whats what but I dont feel like taking the bumper off and pulling the rad tonight if I dont have to
    Last edited by ls1fan74; 08-03-2009 at 03:42 PM.

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    SS#430 1 of 74 7camaro7's Avatar
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    put water in the radiator, start it up, open throttle by hand if yours does that, look around while revving to about 2000rpms

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    footbrake racer racer426's Avatar
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    Maybe go get a pump-up pressure tester They will usually expose a leak pretty quick.

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    Junior Member gihonda00's Avatar
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    There is stuff you can get at any auto store that you can put in your radiator and with a black light you can locate the leak. I would get a pressure tester first so you don't damage any internal components. I asked a friend that I work with and he had mentioned perhaps the heater hose has a leak. Best of Luck

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    thanks, yeah I'm gonna get a pressure tester and try that- as far as I can see, all the hoses are fine-I pulled the intake and the reservoir and the leak seems to be coming from the bottom of the pass. side of the radiator

    edit/update: pulled the cooling fans as well; all the hoses look fine, going into the block, the water pump and running along the bottom of the rad, however there's still coolant puddling under it and dripping from random spots :



    Last edited by ls1fan74; 08-03-2009 at 05:18 PM.

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    Member foxman92's Avatar
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    just seems that you might have a pin hole in the radiator, or a crack in the resivor..

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    Quote Originally Posted by foxman92 View Post
    just seems that you might have a pin hole in the radiator, or a crack in the resivor..
    can i patch that up w/ one of those kits? Or am I looking @ a new ($378) radiator

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    James Bond Spikito's Avatar
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    I was thinking hose...maybe not on of the main two...but theres plenty of small ones...also check your intake gaskets...not a common problem on the LS1...but you never know

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    Member foxman92's Avatar
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    Quote Originally Posted by Spikito View Post
    I was thinking hose...maybe not on of the main two...but theres plenty of small ones...also check your intake gaskets...not a common problem on the LS1...but you never know
    coolant doesnt flow through the intakes on ls1's, they have the cross over tube in the front..

    also i personally dont like to use the radiator leak sealers, just because i dont want all of that to get into the block, i know $378 seems high, but honestly if it is the radiator, i would just replace it.. that way you dont have to worry about that sealer plugging up the block

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    Senior Member qwkgto's Avatar
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    sounds like a hose or a radiator,the plastic tanks on these rads are known for leaks,have you done any recent mods to car like heads etc..head gaskets can cause your radiator to blow as well.

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    Rockin the Ruckus! 02Sweet's Avatar
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    Quote Originally Posted by qwkgto View Post
    sounds like a hose or a radiator,the plastic tanks on these rads are known for leaks,have you done any recent mods to car like heads etc..head gaskets can cause your radiator to blow as well.
    sounds like a hose to me or the reserve tank

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    Member BKHgto04's Avatar
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    Check the plastic tank on the radiator. Going thruogh the same problem right now. For some reason they like to split right down the seam of the tank.

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    Rockin the Ruckus! 02Sweet's Avatar
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    Quote Originally Posted by BKHgto04 View Post
    Check the plastic tank on the radiator. Going thruogh the same problem right now. For some reason they like to split right down the seam of the tank.
    had the same thing happen in my old C/10

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    Quote Originally Posted by BKHgto04 View Post
    Check the plastic tank on the radiator. Going thruogh the same problem right now. For some reason they like to split right down the seam of the tank.

    Do you mean the reserve tank?

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    Rockin the Ruckus! 02Sweet's Avatar
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    Quote Originally Posted by ls1fan74 View Post
    Do you mean the reserve tank?
    yes

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    Member BKHgto04's Avatar
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    Quote Originally Posted by ls1fan74 View Post
    Do you mean the reserve tank?
    no,the plastic tank on the side of the radiator.

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    Rockin the Ruckus! 02Sweet's Avatar
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    Quote Originally Posted by BKHgto04 View Post
    no,the plastic tank on the side of the radiator.
    oh sorry i thought you meant the other one

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    LSX whore allbaugh_04's Avatar
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    So did you start it up with water yet? i skimmed through the thread pretty quickly.

    I'd look for a leak on the radiator since you think all the hoses are good.

  19. #19
    Member BKHgto04's Avatar
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    Quote Originally Posted by 02Sweet View Post
    oh sorry i thought you meant the other one
    oh its cool. The damn thing just split right down the side. Tried to fix it with tank repair putty but that didnt work.

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    James Bond Spikito's Avatar
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    Quote Originally Posted by foxman92 View Post
    coolant doesnt flow through the intakes on ls1's, they have the cross over tube in the front..

    also i personally dont like to use the radiator leak sealers, just because i dont want all of that to get into the block, i know $378 seems high, but honestly if it is the radiator, i would just replace it.. that way you dont have to worry about that sealer plugging up the block
    well that might help explain why its not a common problem

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