A manifold that doesn't crack? - Page 2 - 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 08-17-2012, 11:00 AM   #11
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Glad I have an L67 that I converted off of Dex-Cool.

Once I replaced the LIM gaskets with the good Fel-Pro stuff I shouldn't have a problem.
What did you end up going with, the Zerex G05?

I stuck with Dex Cool, mainly because I always service the coolant in a little over half of the what they say it can last, I really think it is improperly maintained systems that have the problems with Dex Cool, because I have always mixed it at 50/50, have always serviced it sooner than required, I have always used distilled water, and I have always bled the air out of the system properly, and my radiator fins are as clean as they looked when the radiator was new, at least from what I can see when I flush it.
If I ever do change coolants it will be the Zerex G05 though...
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Old 08-17-2012, 11:04 AM   #12
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I tapped and plugged the throttle body coolant ports on my SLE. The material is VERY thin so you have to be careful since you don't have much to thread into, but it worked.
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Old 08-17-2012, 11:17 AM   #13
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What did you end up going with, the Zerex G05?

I stuck with Dex Cool, mainly because I always service the coolant in a little over half of the what they say it can last, I really think it is improperly maintained systems that have the problems with Dex Cool, because I have always mixed it at 50/50, have always serviced it sooner than required, I have always used distilled water, and I have always bled the air out of the system properly, and my radiator fins are as clean as they looked when the radiator was new, at least from what I can see when I flush it.
If I ever do change coolants it will be the Zerex G05 though...
I have no idea what was in it when I bought it, but it wasn't Dex that'* for sure. It had green in it when I bought it. I completely flushed that out though since I had no idea how old it was. It'* got Prestone in it now.
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Old 08-17-2012, 11:24 AM   #14
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This is the UIM I recommend going with, it has an added steel collet where the EGR port is, which along with the reduced diameter EGR Stove Pipe is supposed to keep the EGR area from ever leaking.
GM Intake Manifold Kit
For the lower intake manifold, I always recommend getting the Fel Pro LIM Kit FEL-PRO Part # MS98014T, it has all the gaskets and o-rings you need, unless you block the coolant ports to the throttle body, if you tap and plug those then you really should open up the coolant water bypass a bit.


https://www.gmforum.com/gearheads-11...od-lim-301972/
Here is a thread Bill posted, he mentions L67 and L36, and I have heard of others plug the L36'* TB ports, but everybody says to open up the coolant water bypass ports a bit.
And they also mention rougher running at first when starting the car in winter, since the TB'* air coming in is a lot cooler with those ports plugged..
If I weren't on mobile, I'd give you a billion props. I might just throw out this OEM UIM I have and buy that sheathed one. At least then my gasket hunting is done for me, and I don't have to bother with bypassing the coolant flow.

Have you used that sheathed upper? Is it as reliable as it seems? (Though if I get another 120k out of this car, I'll be surprised!)
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Old 08-17-2012, 12:48 PM   #15
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Someone here had gotten ahold of some custom made stovepipes. I had one installed for a few years until I upgraded the engine. No problems that I have ever seen with it. And yes, I did have the UIM a few times to inspect for other things.
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Old 08-18-2012, 08:34 AM   #16
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If I weren't on mobile, I'd give you a billion props. I might just throw out this OEM UIM I have and buy that sheathed one. At least then my gasket hunting is done for me, and I don't have to bother with bypassing the coolant flow.

Have you used that sheathed upper? Is it as reliable as it seems? (Though if I get another 120k out of this car, I'll be surprised!)
Chances are your old UIM could be reused, and the reduced diameter EGR stove pipe that comes in the LIM Kit, would be enough of a fix to keep the coolant from ever leaking around the EGR, but if you are not plugging the coolant ports I would definitely go with that Ineedparts UIM, as I am betting the old UIM has had the UIM softened around where the throttle body gasket goes, when I removed my TB Gasket I barely touched what holds the gasket in, and it started falling apart, the car had never ran hot and only had 134k on it.
I did not go with this one because money was tight, so I just went with re-manufactured UIM from Dorman, which I am not sure, but I believe the Dorman reman is the same as the Ineedpart UIM, minus the steel bushing, I did put the reduced diameter EGR stove pipe in though, a tip when you put that in, use the old EGR stove pipe, it fits down over the new one perfectly, and you just tap it in..
I did have a friend that went with that UIM, but they have only driven the car about a year since replacing it.
I am sure that is the best overall fix, and I can see it lasting the rest of the life of the car, as long as the coolant is always changed regularly, and the coolant system is bled of air properly.
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Old 08-18-2012, 09:35 AM   #17
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What did you end up going with, the Zerex G05?

I stuck with Dex Cool, mainly because I always service the coolant in a little over half of the what they say it can last, I really think it is improperly maintained systems that have the problems with Dex Cool, because I have always mixed it at 50/50, have always serviced it sooner than required, I have always used distilled water, and I have always bled the air out of the system properly, and my radiator fins are as clean as they looked when the radiator was new, at least from what I can see when I flush it.
If I ever do change coolants it will be the Zerex G05 though...

my 03 monte and my moms impala were in the 30 to 50k range when the dexcool made the pudding in my rad and overflow which never came out stained everything no matter how many times i flushed it. im sure no one even opened my rad cap because i just look at the over flow level without opening the cap. ive always ran prestone extended life in everything. and when i was talking to the guys at the dealer where i buy my cars they change it to that too
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Old 08-18-2012, 09:38 AM   #18
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i was doing about 40-50k per year and it was about a year old too
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3800 series ii, bonneville, coolant loss, egr, hydrolock, pontiac, uim, upper intake, upper intake manifold

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