Coolant loss - 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 02-23-2003, 06:55 PM   #1
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Default Coolant loss

I just was just looking under the hood and happened to knotice that there was maby an inch of coolant in the bottom of the overflow tank, it was just filled up 2 weeks ago so I am thinking that there is a problem. I have not noticed any puddles under the car. Any thoughts???
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Old 02-23-2003, 07:31 PM   #2
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It'* gonna be a hunt. You're burning it somewhere. Upper intake, lower intake, or heads probably. Hard to say. It still could be an external leak, but only coming out when the engine is running, so there wouldn't be a puddle. Or a leak so slow, it'* evaporating off the intake or block from the heat. You just have to dig. At least you don't have the plastic upper intake to worry about. edited a few seconds later.....yes you DO have the plastic upper. That'* your primary focus now.
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Old 02-23-2003, 10:06 PM   #3
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Let us not forget the all wounderful gm waterpump, I just chainged mine yesterday again after 80,000
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Old 02-23-2003, 11:06 PM   #4
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by willwren
It'* gonna be a hunt. You're burning it somewhere. Upper intake, lower intake, or heads probably. Hard to say. It still could be an external leak, but only coming out when the engine is running, so there wouldn't be a puddle. Or a leak so slow, it'* evaporating off the intake or block from the heat. You just have to dig. At least you don't have the plastic upper intake to worry about. edited a few seconds later.....yes you DO have the plastic upper. That'* your primary focus now.

That plastic upper intake on the 95 and later VIN # K bonnevilles are some serious **** to worry about when you start loosing coolant... Also look at the water pump from the bottom of the car... You need to have the car off the ground but look abobe the oil filter and see if the weep holes are showing signs of leakage... If there are no signs at all, and you find no bad hoses, or leaks around the engine at all but the use of coolant gets worse, then susspect the upper intake as the culprit in your coolant consumption... Be very careful here.... We have had a few destroyed engines due to this very problem...
Good luck to you... Let us know if there is anything else you need to know...
How much do I need to dilute the antifreeze, or can i just put it straight in?? Also, how do I check the upper intake?
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Old 02-24-2003, 12:15 AM   #5
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50/50 on the mix. Checking the upper intake isn't really possible without pulling it apart. It'* a matter of ruling out the water pump, both radiator hoses, the heater hoses, and the coolant inlet and egr inlet on the upper intake. If you still don't see any evidence of a leak on the outside, you have to tear into it. Your intake may or may not be cracked at that point. It could be as simple as replacing the seals. If you don't fix it there, it could be the lower intake or (rarely) the heads. If you do tear into it, you'll know where it'* leaking. Water injection has a habit of cleaning things. You'll have a clean runner or two in the lower intake if the upper is leaking. If it all looks the same, you have to dig lower. Eventually, you'll find one or two clean cylinders. It'* a step at a time.
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Old 02-24-2003, 11:51 AM   #6
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Quote:
Originally Posted by Chris&Stacy
Let us not forget the all wounderful gm waterpump, I just chainged mine yesterday again after 80,000
Dude, what are you doing to your car? I've got 100,000 and I've only had the customary upper plenum meltdown. Still on the original alt, WP and belt. New belt in the spring, but that'* because we're going to pull the motor and give it a much needed Comp Cam. Zoom-Zoom.
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Old 03-01-2003, 04:42 PM   #7
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Quote:
Originally Posted by Chris&Stacy
Let us not forget the all wounderful gm waterpump, I just chainged mine yesterday again after 80,000
Ok, I just topped you, mine went bad right around 51,000 miles. now for the real, question how much should it cost to change the water pump??
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Old 03-01-2003, 04:44 PM   #8
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Should take you about 2 hours taking your time, and cost about $35.
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Old 03-01-2003, 04:45 PM   #9
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Quote:
Originally Posted by willwren
Should take you about 2 hours taking your time, and cost about $35.
How about a shops time???(my mother is insisting that i get stuff done at a local garage, so she gets the bill)
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