Had a coolant leak - 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 09-16-2007, 05:51 PM   #1
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Default Had a coolant leak

I pulled my tb off and it looked like this:
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Looks half decent for its age:
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This is where I am at after some disassebling and cleaning:
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New gasket:
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Polished up my throttle plate:
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All cleaned up and repainted:
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I softened the back side edges with a wire wheel and high speed drill, also filled in the coolant passage with JB weld.
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Old 09-16-2007, 06:04 PM   #2
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FIX IT NOW!!!!!

Sorry to yell, but you have a UIM failure/LIM gasket failure. I suggest you get it repaired ASAP, if you value your engine.

http://www.bonnevilleclub.com/forum/...e=article&k=38
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Old 09-16-2007, 06:32 PM   #3
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funny thing is, its not leaking anymore. That and my tb is still cool to the touch after running for a hour.
But you are right, I will have to do it sooner or later.
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Old 09-16-2007, 07:24 PM   #4
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No way. That clean throttle plate is a MAJOR clue. It should be sooty and black. It'* clean. That means MOISTURE.

Tear that sucker apart ASAP. Watch your oil and coolant like a HAWK. That TB should NOT look like that after 5k miles.

Moving to 92-99. This isn't a Performance topic.
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Old 09-16-2007, 07:40 PM   #5
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I did clean it last year but I understand what your saying Will, its almost like its getting steam cleaned. I did notice a little steam comming out of my exhaust and I was like I shouldn't be able to see that till winter. After plugging the coolant passage and a new TB gasket, I will still keep a close eye on it even though the leak appears to have stopped and no more "steam" comming through exhast after running for over an hour.
I may have fixed this problem but I know you guys are right about having to change my UIM ASAP. Will your opinion is almost god when it comes to bonnevilles. I will change UIM ASAP.
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Old 09-16-2007, 08:37 PM   #6
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You have not fixed the problem until you replace the UIM and LIM gaskets.

Whether it leaks or not, you still have a problem. Invest the $200 before it costs you your motor.
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Old 09-16-2007, 09:47 PM   #7
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I will do it in 2 weeks crossing fingers. I expect to bonus this month so I will have the cash. I did notice a little(very very little) extra snap in the throttle response. These 3800'* are ****** for air flow arn't they? It seems like it loves to be tweaked and smoothed over and there are plenty of places to smooth. LIM, TB and so on...
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Old 09-17-2007, 10:53 AM   #8
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Bill and Bill aka William. We don't know from the pictures if the problem was a TB gasket or an UIM. The coolant in one pic looks a bit close to the TB and not even near the EGR stovepipe area.

Toasted had coolant leaking and was pretty sure his UIM had failed. We changed what was a perfectly good intake (I checked the bore with a pick and screwdriver, it looked and acted like a new intake) over a TB gasket.

TB gaskets are possible while being more unlikely, it is possible. If the steam has stopped coming out the tail pipe, my thoughts would be a bad TB gasket at this point.
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Old 09-17-2007, 11:54 AM   #9
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Worth guessing?

Probably not. If it'* an OEM upper, certainly not. It needs to be changed regardless.
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Old 09-17-2007, 03:07 PM   #10
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I agree it should be done. I didn't quite agree that it appeared that we shot first and diagnosed later.
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