1997 Cutlass Supreme
 

1997 Olds Cutlass Supreme 3.1 V6 approx. 90,000 miles
In about 6 months three times the car overheated, the radiator overflow tank
bubbled out, temp gage went up to red etc......I let it cool, topped off
with antifreeze/water and for the most part it went back to normal.
Previously I had replaced aging dexcool anti-freeze and because the stuff
had "jelled" some (no overheating problem at that time) I used a radiator
cleaner etc. (I eventually cleaned and replaced fluid twice). During the 6
months I replaced the thermostat and had a water pump go out. In those
months we did several long trips of a couple thousand miles and used it as
our daily driver.....Then for the last overheating adventure I had some
steam out of the exhaust and water in the oil. Now I've torn it down and
more or less as expected found a bad lower manifold gasket (leaking water
into the manifold)......I pulled the heads and the gaskets were fine....
presently a machine shop is testing them......While the manifold gasket
addresses the current "chocolate milk oil" I don't see how it addresses the
earlier apparent "exhaust gas leaks" into the cooling system.

If the heads check out any best guesses?

When reasembling any hints or tips?


Thanks Rod

1997 Cutlass Supreme
 

I don't see where and how you determined the exhaust gas leaks in the post.
"Rod & Betty Jo" > wrote in message
...
> 1997 Olds Cutlass Supreme 3.1 V6 approx. 90,000 miles
> In about 6 months three times the car overheated, the radiator overflow
> tank bubbled out, temp gage went up to red etc......I let it cool, topped
> off with antifreeze/water and for the most part it went back to normal.
> Previously I had replaced aging dexcool anti-freeze and because the stuff
> had "jelled" some (no overheating problem at that time) I used a radiator
> cleaner etc. (I eventually cleaned and replaced fluid twice). During the
> 6 months I replaced the thermostat and had a water pump go out. In those
> months we did several long trips of a couple thousand miles and used it as
> our daily driver.....Then for the last overheating adventure I had some
> steam out of the exhaust and water in the oil. Now I've torn it down and
> more or less as expected found a bad lower manifold gasket (leaking water
> into the manifold)......I pulled the heads and the gaskets were fine....
> presently a machine shop is testing them......While the manifold gasket
> addresses the current "chocolate milk oil" I don't see how it addresses
> the earlier apparent "exhaust gas leaks" into the cooling system.
>
> If the heads check out any best guesses?
>
> When reasembling any hints or tips?
>
>
> Thanks Rod
>
>



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