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Old 08-26-2004, 08:10 AM   #1 (permalink)
Stephen
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Default exhaust fumes getting into the cooling system

I have a 97 Chevy Venture that was overheating. I had tried a few
things (new thermostat, coolant refill, bled air from coolant system)
so I took it to a mechanic. He told me that there were exhaust fumes
getting into the cooling system and that I needed to replace the head
gaskets. Unfortunately, when I took the heads off I did not see any
obvious problems with the gasket. I did find that the water returns
in the heads were about 50% clogged with sludge (could be from
radiator stop-leak that I used a few months ago). I am now worried
that the gasket may not be the problem. What should I do now? Do I
put it all back together with new gaskets and hope for the best? Is
there anything else I can look for?

Thanks in advance,
-Stephen Smith

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Old 08-26-2004, 08:10 AM   #2 (permalink)
Steve W.
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Default Re: exhaust fumes getting into the cooling system

Clean them up real good an look real close for cracks, also check the
block over good. Might have the heads magna-fluxed as well.
BUT it doesn't take much of a leak to cause problems, especially on the
newer engines.

--
Steve Williams



"Stephen" <smithinlast@yahoo.com> wrote in message
news:f5892011.0404191407.c01779a@posting.google.co m...
> I have a 97 Chevy Venture that was overheating. I had tried a few
> things (new thermostat, coolant refill, bled air from coolant system)
> so I took it to a mechanic. He told me that there were exhaust fumes
> getting into the cooling system and that I needed to replace the head
> gaskets. Unfortunately, when I took the heads off I did not see any
> obvious problems with the gasket. I did find that the water returns
> in the heads were about 50% clogged with sludge (could be from
> radiator stop-leak that I used a few months ago). I am now worried
> that the gasket may not be the problem. What should I do now? Do I
> put it all back together with new gaskets and hope for the best? Is
> there anything else I can look for?
>
> Thanks in advance,
> -Stephen Smith



 
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Old 08-26-2004, 08:10 AM   #3 (permalink)
shiden_Kai
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Default Re: exhaust fumes getting into the cooling system


"Stephen" wrote

> I have a 97 Chevy Venture that was overheating. I had tried a few
> things (new thermostat, coolant refill, bled air from coolant system)
> so I took it to a mechanic. He told me that there were exhaust fumes
> getting into the cooling system and that I needed to replace the head
> gaskets. Unfortunately, when I took the heads off I did not see any
> obvious problems with the gasket. I did find that the water returns
> in the heads were about 50% clogged with sludge (could be from
> radiator stop-leak that I used a few months ago). I am now worried
> that the gasket may not be the problem. What should I do now? Do I
> put it all back together with new gaskets and hope for the best? Is
> there anything else I can look for?


I've never seen a head gasket on a Venture van (3400) leak
combustion into the cooling system. Of course, I usually don't
see extremely high mileage engines, so it is possible. Usually,
the gaskets split and leak externally. The only other possiblity
is a cracked head...again..rather rare on these engines.

I would have the heads checked for cracks and if nothing is
found, throw it back together and see how she runs. Make
sure there is nothing wrong with the water pump (again, very
rare, about all that happens with these water pumps is that
they leak) Perhaps you have something clogging the radiator,
or condensor?

Ian


 
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Old 08-26-2004, 08:10 AM   #4 (permalink)
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Default Re: exhaust fumes getting into the cooling system

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

Dean.Lee@wellpoint.com

"Stephen" <smithinlast@yahoo.com> wrote in message
news:f5892011.0404191407.c01779a@posting.google.co m...
> I have a 97 Chevy Venture that was overheating. I had tried a few
> things (new thermostat, coolant refill, bled air from coolant system)
> so I took it to a mechanic. He told me that there were exhaust fumes
> getting into the cooling system and that I needed to replace the head
> gaskets. Unfortunately, when I took the heads off I did not see any
> obvious problems with the gasket. I did find that the water returns
> in the heads were about 50% clogged with sludge (could be from
> radiator stop-leak that I used a few months ago). I am now worried
> that the gasket may not be the problem. What should I do now? Do I
> put it all back together with new gaskets and hope for the best? Is
> there anything else I can look for?
>
> Thanks in advance,
> -Stephen Smith



 
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Old 08-26-2004, 08:10 AM   #5 (permalink)
Charles Bendig
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Default Re: exhaust fumes getting into the cooling system


"Stephen" <smithinlast@yahoo.com> wrote in message
news:f5892011.0404191407.c01779a@posting.google.co m...
> I have a 97 Chevy Venture that was overheating. I had tried a few
> things (new thermostat, coolant refill, bled air from coolant system)
> so I took it to a mechanic. He told me that there were exhaust fumes
> getting into the cooling system and that I needed to replace the head
> gaskets. Unfortunately, when I took the heads off I did not see any
> obvious problems with the gasket. I did find that the water returns
> in the heads were about 50% clogged with sludge (could be from
> radiator stop-leak that I used a few months ago). I am now worried
> that the gasket may not be the problem. What should I do now? Do I
> put it all back together with new gaskets and hope for the best? Is
> there anything else I can look for?
>
> Thanks in advance,
> -Stephen Smith


Call a few machine shops, find one with a reasonible price on pressure
testing cylinder heads. Have the heads pressure tested. If they pass, have
them mill the deck surface to clean it up.

If you find you have a cracked head, get one from a salvage yard. Have
it pressure tested before install. As well as milled.

Having the heads milled trues the gasket sealing surface. Not really an
issue on 50K and less engines. Yet older, high milage engines can have
slightly warped sealing surfaces.

You might also have your intake manifold sand blasted. Then look for
cracks. If the Cross over is cracked next to a cooliant passage this could
also cause the problem.

Charles


 
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Old 08-26-2004, 08:10 AM   #6 (permalink)
Stephen
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Default Re: exhaust fumes getting into the cooling system

The van does have about 100K miles on it. I should have mentioned that.

-Stephen Smith
 
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