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 04-30-2007, 06:13 PM   #1
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Hi everyone.. Looks like I too have upper/lower intake manifold leaks.
Losing about a 1.5" out of recovery tank and visiible leakage on end seals?
Upper seals were changed by dealer in 2000. Intake plenum appears
to have date of 2000 on it. Oil wickage around front LH/ RH rear intake
mount bolts. Thinking about APN kit for upper and GM Aluminum on lower?
BTW great forum! Looks like its time to put the FSM to use after 12 years.
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Old 04-30-2007, 06:52 PM   #2
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Sounds like you hit it dead on the money.... and yes those parts will work for you.... Fix it ASAP before you place a rod through the block.... Get the oil drained ASAP as well... even if its the cheapie oil just to get the bearing washed off... Do the Lower gaskets and upper intake and change the oil again ( Cheapie stuff ) drive a couple hundred and go back to your normal oil...

<----- 155K on my 95 and I'm on intake #3

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Old 04-30-2007, 07:23 PM   #3
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And of course get rid of the Dex-cool (I think that started in '95?) if you haven't already and use one of the new replacement antifreezes. (Plugs can take a beating from Dex-Cool if it gets into the combustion areas, so remember to look at them/change them, while you have more elbow room.)

If you change the valve cover gaskets, the blue Felpro gaskets are awfully nice.

And of course the gearheads/admins will walk you through problems, if you listen to them and try what they say to do. They sure helped me alot when I did mine .
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Old 04-30-2007, 07:26 PM   #4
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96 Model year Bonneville got the dex, 95 was the last year they used the green in the H bodies...

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Old 04-30-2007, 07:28 PM   #5
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ok, thanks, good to know.
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Old 05-01-2007, 01:38 PM   #6
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Quote:
Fm Jr'* 3800
155K on my 95 and I'm on intake #3
In my wife'* case, 71,000 miles on the '97 and on the 3rd UIM.
The last one got only 14,000 miles on it. What I found interesting was the date on the UIM [3/23/03, no record of any UIM?LIM work performed on the car. Any idea if Warranty work listed separately, from 'contracted' work.
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Old 05-01-2007, 01:41 PM   #7
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Since we're on the bandwagon.... The only reason I've made it to 172K is by going through 3 UIMs. I'm on #4.
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Old 05-01-2007, 01:59 PM   #8
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Originally Posted by vital49
Since we're on the bandwagon.... The only reason I've made it to 171K is by going through 6 UIMs. I'm on #7.
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