Possible LIM/UIM Problems? - 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 07-08-2007, 07:30 PM   #1
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Default Possible LIM/UIM Problems?

After searching all over for a couple of days about putting in a 180 thermostat, I went out and checked my coolant reserve tank...This is where i first started to worry, since the coolant is no more an orange color, but looks like coffee. Could this be oil in the coolant? And if it is, where do I go from there?
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Old 07-08-2007, 07:47 PM   #2
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what does the water feel/smell like?

Have you flushed the cooling system yet?, sounds like a good time.
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Old 07-08-2007, 07:48 PM   #3
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Thats not a good sign. If you haven't read the tech article below, I suggest you do so asap. I would plan on changing out the LIM gaskets and UIM even if you currently beleive them to be good.

http://www.bonnevilleclub.com/forum/...e=article&k=38
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Old 07-08-2007, 07:49 PM   #4
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96bonnie, you do not have a UIM, as your supercharger acts as the UIM (upper intake manifold). If anything, your LIM gaskets are going. Please check your oil, if it has ANY signs of mixing with coolant, drain it ASAP, or you will damage your bottom end.
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Old 07-08-2007, 07:53 PM   #5
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Quote:
Originally Posted by Bonneville92V688
96bonnie, you do not have a UIM, as your supercharger acts as the UIM (upper intake manifold). If anything, your LIM gaskets are going. Please check your oil, if it has ANY signs of mixing with coolant, drain it ASAP, or you will damage your bottom end.
Thanks - I missed that SSEi in the sig
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Old 07-08-2007, 07:54 PM   #6
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As stated, the UIM failure is not valid with a supercharged engine. But your LIM gaskets are just as susceptible to DEX failure.

I'd suggest flushing the cooling system and preplacing your coolant with Dex-compatible fluid, and change your LIM gaskets at the same time.
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Old 07-08-2007, 08:19 PM   #7
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i would probably have the stealership do the procedure.....would it be bad to replace the thermostat with a 180 degree while they are flushing everything? I live in nebraska and we can get some cold winters, not as bad as other states obviously, but I'm a little worried that my car will not warm up properly...also, I have noticed my temp guage easily going over the 200 degree mark, which is why i started checking all of this stuff out
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Old 07-08-2007, 08:22 PM   #8
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I would go to a local Radiator shop and have them pressure check the cooling system. Wont be too much $$ and they would be good for flushing as well.

When does it go over the 200 mark (and by how much)? going fast, in traffic, AC-On/Off?
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Old 07-08-2007, 08:26 PM   #9
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it will easily almost go to the next mark past 200 while idle/city driving, but when im going 60 down the highway it will go back down to just a tad over 200
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Old 07-08-2007, 08:39 PM   #10
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For the temps...

You may use the 180F T-Stat, But also keep in mind the Radiator fins can become clogged with dirt and other particles..

On another Note the 1996+ Bonnevilles all got the same radiator regardless of Options or engine designation.. 1996 and up Bonnies no longer had Heavy Duty Cooling.....

If you have the original Radiator and were to peek under the radiator cover you'd fall on the floor once you saw the size of the Core.. You will be left wondering how the car didn't get any hotter



Heavy Duty Core on the top, stock core on the Bottom

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