Question about 1998 GMC Jimmy

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Leaking anti-freeze from back of motor onto exhaust-where would leak be most likely?

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You probably have the 3.4 p.o.s . the lower intake gasket is leaking

Posted on Nov 20, 2009

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Rear crossover ports on the intake manifold, and/or freeze plugs at the rear of the engine. Also see if there is a hot water control valve for the heater in that area.

Posted on Nov 20, 2009

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1 Answer

My truck is leaking anti-freeze between the engine block and transmission bell housing. Anti-freeze leaks onto the crossover exhaust pipe. Any ideas on how to fix this cheaply?


There is a freeze plug back there that must have came out. The plug is cheap, but you have to take the transmission off to get to it.

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if cant find any spots on the ground an you're still losing anti-freeze, from my experience its always been the headgasket, if the headgasket isnt fully blown out your car will seem like its running fine an burn the antifreeze up during the combustion stroke of the engine, or it could be leaking onto the exhaust. check to see if theres any puddles of anti-freeze on top of the engine an check for leaks around the heads. if there is no puddles of leaks it could be your antifreeze is leaking into the engine an burning up during the combustion stroke

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Using antifreeze but i see no visible leak


If you exhaust is constantly emitting white exhaust fumes the whitest color is your coolant being extracted from an internal gasket leaking

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Leaking anti freeze from back of engine cannot see where the leak is it is not the heater hoses or the waterpump


It is possible that it may be the intake manifold leaking. If it is a 3.8 or 3.1 liter V-6 I would check the intake manifold gasket. These have a plastic gasket with silicone on each end that tend to crack and start leaking. you can normally see the leak behind the exhaust crossover pipe on the back side of the engine.

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2001 CHEVY SILVERADO 5.3 Z71 The truck uses 1 gal of antifreeze


check for a wet tailpipe,which might indicate a leak between water jacket & combustion chamber.i.e.headgasket.check heater hose isn't leaking onto exhaust manifold,'cooking' the anti-freeze as it leaks.

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1 Answer

Anti freeze leeking


I have seen a couple of these now with headgasket leaks to the outside of the block just as you describe. I solved them both with a stop-leak additive, not something I would normally use, but I really didn't want to pull the heads because the exhaust studs always break on these engines. I would find out for sure where the leak is before proceeding though. If it's a hose or frost plug, you'll have to repair it properly.

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Not really. The head gasket is not mendable from outside with epoxy or inside with sealers. Good luck.

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Leaking anti-freeze from top of motor


Dex Cool Antifreeze likes to eat seals and gaskets. My Guess! That the exhaust gasket is leaking on the back side of the engine.
It is a common and expensive problem GM products have.
You could try stop leak (NEVER DUMP THE WHOLE CONTAINER IN! It can plug the system up!) To use, when cool, open the radiator cap, and take a teaspoon full of the stop leak and put in ( run engine to full temp) and watch for a week (Did it slow down or stop?), if still leaking repeat the above. Barring this working, it is very pricey to replace that gasket. It worked for me.

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1 Answer

Losing Anti-Freeze


hi get it prussure tested if you are correct in saying there is no sign of a leak or signs of water in the exhaust then you will have a leak and what is happening is it is evaporating as it leaks hence on sign of leak usually theseleaks are found where hose are near something hot example exhaust manifold the pressure tester will make the leak visable yates210456

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