Disappearing Coolant - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-19-2005, 02:20 AM   #1
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Default Disappearing Coolant

My 1990 Bonneville has been using coolant for about the last 15,000 miles. About half a gallon every 2-3 thousand miles. When I park it in the garage it does not leave a puddle, no coolant on the floor from the heater core, no oil in the coolant or coolant in the oil... where is it going? I should have been concerned long before now, but I tried convincing myself that I was just working air out of the system for a while. But now that I have added over 2 gallons in the last 15,000 miles I am thinking something may be wrong. Is there any other kind of internal leak that could be happening that these engines are known for?
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Old 01-19-2005, 02:38 AM   #2
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MINE TOO!!! prolly leaking on top of the block, right by a manifold, or even a blown head gasket. let us know when you figure it out.
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Old 01-19-2005, 07:36 AM   #3
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Perhaps on the tstat housing? Cold start the car, rev a little with the hood popped.. you see anything leaking?


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Old 01-19-2005, 09:26 AM   #4
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I have searched for a leak at all the possible locations.. nothing found. Is it possible the car is somehow burning off the coolant without contaminating the oil or the coolant? Maybe it only leaks in driving conditions, like anything over 3k rpm or something. I really don't know, it still runs fine so I havn't been to worried; although this cold weather makes it a lot of fun to start when I leave it out for the night
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Old 01-19-2005, 12:42 PM   #5
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What trim level do you have? LE, SE, SSE?


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Old 01-19-2005, 04:09 PM   #6
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5 oz per tank ? Water injection maybe ?
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Old 01-19-2005, 09:27 PM   #7
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Got any white smoke coming out?
As said before, start the engine and check for leeks under the hood and under the car...
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Old 01-19-2005, 09:47 PM   #8
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This is an LE. There is plenty of steam coming out of the exhaust, but it is around 15 degrees F here right now, so thats not unusual, and it still runs great. Next time I have the garage warmed up I'll just have to do a taste test of any wet areas on the engine and see if I find anything sweet. At least one person has the same problem I do.
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Old 01-23-2005, 12:22 PM   #9
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Default leak

if there is nothing external it must be an internal leak.
Bars leaks?
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Old 01-23-2005, 01:22 PM   #10
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A flush and fill with some Bar'* sounds great. BTW: Stuff works wonders.. broken radiator was fixed in 10seconds of idling with that stuff. If I had a coolant leak.. i'd use that stuff. All their products are good stuff, btw.


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