LT1-LT4 Modifications 1993-97 Gen II Small Block V8

What are the most common coolant leak spots?

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Old 10-29-2007, 10:04 AM
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Default What are the most common coolant leak spots?

Recently my coolant has started to drop exponentially it seems. I can see my temp gauge shooting low-high-low when I take turns and stuff, especially before my thermostat opens it seems. I do not see any major puddles in my garage. I have 110k miles, it looks like an original water pump, but I have not seen any coolant come from the water pump. I have done some searching and it seems the gaskets can be a problem? I do not think I am burning any, I don't smell any coolant in the exhaust.

What are the most common coolant leaks in these motors? Considering a 110k LT1.

I use cheap 50/50 coolant. I'll probably flush and fill with Dex-Cool next week or so.

Last edited by HoLLo; 10-29-2007 at 10:13 AM.
Old 10-29-2007, 10:28 AM
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waterpump is most commen from my knowledge and it drips into the opti, potentially ruining it.
Old 10-29-2007, 10:28 AM
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only if it is a vented opti
Old 10-29-2007, 10:37 AM
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Hey moserman, I'm from the Pottsville area.

Just to clarify, vented opti's are on 95-97 and nonvented are 93-94 fbodies, correct?

+1 for the waterpump. I replaced my opti and my waterpump decided to gush coolant twice now since that operation. Electric WP ***!
Old 10-29-2007, 11:01 AM
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Cheap coolant shouldn't make any difference. Should cool just fine. Just find the leak. Be very careful with Dex Cool cuz mixing any of it with the green stuff causes mass contamination.
Old 10-29-2007, 01:19 PM
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Ok, Yeah its definitely the water pump. It leaks pretty bad now. Gonna pick one up SOON. I think its either the passenger side gasket, a hose, or the weap hole. It's flinging coolant all over my engine bay. I'm gonna jack it up tonight and see where it is coming from exactly,.
Old 10-29-2007, 02:17 PM
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Originally Posted by harner
Hey moserman, I'm from the Pottsville area.

Just to clarify, vented opti's are on 95-97 and nonvented are 93-94 fbodies, correct?

+1 for the waterpump. I replaced my opti and my waterpump decided to gush coolant twice now since that operation. Electric WP ***!


you are correct.



i would replace it with an electric waterpump because its just going to keep spitting coolant out as soon as the slightest tear occurs in any of the seals inside the housing.
Old 10-29-2007, 09:00 PM
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Actually, I think I found my problem. I don't see anything coming from the weap hole. I found a hose that seems to be busted. It looks like it is a significant amount of leaking.

Included pics of the hose, and the water pump weap hole. I see no signs of leaking on the pump. Does this hose have coolant entering or exiting the water pump, and what does it directly connect to? I could not find it. I obviously need to replace this hose, but I don't know exactly what kind of hose to ask for. Maybe a part number?
Attached Thumbnails What are the most common coolant leak spots?-dscf07101.jpg   What are the most common coolant leak spots?-dscf07161.jpg  
Old 10-29-2007, 09:10 PM
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That hose you have pic'd first actually got a pinhole sized leak on me a while back and would jet coolant all over. I just cut it and placed an piece of tubing in the hose and clamped it to fix it. These cars can be buggers sometimes. Hope you got it worked out. It also gave me an excuse to do the throttle body bypass lol.
Old 10-29-2007, 10:07 PM
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TB Bypass has already been done on this car too. I'd like to replace the entire hose, because i had to fix a bad crimp in it one day, possibly causing this leak in the long run..
Old 10-31-2007, 09:55 AM
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Do you know what size hose it was?
Old 10-31-2007, 10:28 AM
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Mine went bad as well. I was trying to find a coolant leak as well and I saw it dripping from that peice. As soon as I started touching it, it broke in half! It is the flow restrictor for the heater core. I just cut mine out and spliced in a peice of hose. You *MIGHT* not get as hot of heat without it, or you *MIGHT* have premature heater core failure, but I read around and those seem to be small risks.

EDIT: Just realized that all the hose replacement kits don't even have this part so you will be good to just cut that part out and splice the hoses together.

Last edited by RedRyder518; 10-31-2007 at 10:35 AM.
Old 10-31-2007, 11:02 AM
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Hm, If I could get a part number and order the correct hose I would rather than rigging something. But i guess I'll go ahead and get a hose barb coupler today.. Thanks!
Old 10-31-2007, 11:15 AM
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It is part #13...
Attached Thumbnails What are the most common coolant leak spots?-heater_hoses.jpg  

Last edited by RedRyder518; 10-31-2007 at 11:21 AM.
Old 10-31-2007, 02:57 PM
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weep hole on water pump or heater core tend to be pretty common
Old 06-27-2010, 12:07 AM
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Originally Posted by myltwon
weep hole on water pump or heater core tend to be pretty common
when the heater core leaks does it usually drip by the firewall or inside the car? i know some cars have a catch pan that will drain it outside the car so you never get a wet carpet. my gtu beretta did. mines dripping near the firewall



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