Disapearing coolent? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-10-2002, 01:24 PM   #1
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Default Disapearing coolent?

My neighbor had a 98 Bonneville and his engine coolent kept disapering, this was happing becase the coolent was leaking through the heads and coming out the exhaust! My Bonneville was loosing coolent to, but after he told me this i out some engine coolent sealent in it and havent had any probllems, just keep an eye on your fluids!
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Old 10-10-2002, 01:34 PM   #2
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Be weary about the coolant stop leak crap additives. I too have similar problem.. not as bad right now from what it appears.. it always drops down a little under cold mark when hot.. but never really went down any further.. even after I fill it up to the proper line. I say this because those additives clog everything up within the coolant system... had a friend who had to replace the heater core because of it ( too lazy to fix the radiator properly ).. which caused the cooling system to be plugged.. which in turn fried his head gasket.. warped his head.. and plugged his heater core.. I rather pay 50 bucks to replace the part ( rad / core ) then to have to spend couple hundred for a new cooling system.
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Old 10-10-2002, 01:58 PM   #3
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I had a similar problem too (96 SE). Turned out I had a busted HTC valve under the upper intake manifold. Mech said it'* a common prob. Also had to replace the upper intake manifold due to leaking....apparently this is one of the bonneville'* weaknesses.
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Old 10-10-2002, 09:46 PM   #4
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Quote:
Originally Posted by throb
I had a similar problem too (96 SE). Turned out I had a busted HTC valve under the upper intake manifold. Mech said it'* a common prob. Also had to replace the upper intake manifold due to leaking....apparently this is one of the bonneville'* weaknesses.
This will seize your engine !!!
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Old 10-10-2002, 10:01 PM   #5
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BTW: Dex-Cool evaporates very, very quickly! You're going to have to use coolant dye to find the leak or get a pressure test done on the system!
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Old 10-10-2002, 10:08 PM   #6
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Good point! Sooooo how does he do it?
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Old 10-10-2002, 10:11 PM   #7
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Coolant stop leak is JUST A TEMPORARY FIX! The problem is still there! Don't let it slide too long of more problems will develope like Head Gaskets &/or heads warp; manifolds crack & engine boils over!
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Old 10-11-2002, 12:32 AM   #8
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JSeabert'* 93SSE may have this same problem. We're watching it for now.
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Old 10-11-2002, 01:31 AM   #9
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Plastic, and plastic. (even has the stupid 'recycle' logos on top!) I'll check that fitting this weekend, too. Thanks, Jr.
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Old 10-11-2002, 09:29 AM   #10
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You guys heard of Mark Salem? Speaking of Dex Cool, I was looking at his website where he talks about it....he dernt like it. In fact, he thinks it contributes to corrosion and recommends using the regular green stuff. You guys have any opinion on this?
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