93 bonneville 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 07-16-2007, 01:07 AM   #1
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Default 93 bonneville coolant leak

I have a 93 bonneville that has a coolant leak that I can't locate. A friend suggested I locate the freeze plugs but I can't locate them. please help?

93 bonneville se
3.8.



If you need any more info about the car let me know.
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Old 07-16-2007, 01:33 AM   #2
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Hello and welcome to the club! Yoursubject title needs to be more specific; i editted it for you. Unfortunately we can't tell you where your car is leaking...you're the one with access to the car, lol. Freeze plugs don't seem to be a big issue with these engines. Some common places are: (ranked in order of most common to least common, IMO)

-where the throttlebody joins to the upper intake manifold
-in front of the power steering pump where the heater hose goes into the lower intake manifold
-the water pump itself
-heater core
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Old 07-16-2007, 02:10 AM   #3
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Any signs of coolant under the car which would give some type of an idea of from where it is leaking?
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Old 07-16-2007, 09:34 AM   #4
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If you give us a general location of the leak..we can tell you the usual suspects.
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Old 07-16-2007, 09:43 AM   #5
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I'd say it'* the passenger side under the engine is where I see it coming from. It doesn't look like it'* coming from the water pump my friend couldn't find any leak around it. Thanks for you help and understanding
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Old 07-16-2007, 09:49 AM   #6
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Well..that would be waterpump or coolant bypass from the waterpump area. The freeze plugs are 1/3 and 2/3 of the way back on each side of the engine.
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Old 07-16-2007, 09:52 AM   #7
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Where is the bypass hose located?
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Old 07-16-2007, 09:56 AM   #8
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Right around the water pump. I'm not 100% on your engine.
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Old 07-16-2007, 09:57 AM   #9
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It comes out the top of the water pump then into the LIM through a plastic barb fitting that should be replaced with steel.

Check the weep hole on the bottom of the water pump.
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Old 07-16-2007, 10:02 AM   #10
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I've got a dumb question LIM ? What does that stand for? If I was to guess lower intake manifold? Thanks again.
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