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Posted on Jan 02, 2017
SOURCE: I am leaking coolant from
First, I am assuming that your vehicle is equipped with the 3.1L V-6 and NOT the 3.8L V-6? (Engine size is really nice to know in situations like this!)
It could be any where in the cooling system. The intake gaskets also like to leak externally. A bad intake gasket does not always mix antifreeze with the oil. Take a flashlight and look for coolant on top and/or down each side of the transmission bell housing. This is VERY common on these engines. It may be leaking just enough to where the exhaust crossover pipe is burning it up (and stinking) before it has a chance to run on the ground. Also look for stains on the intake manifold-to block mating surfaces and on the side of the bell housing that will indicate a leak. if your vehicle is still using Dex-Cool, the stains will be pink. If your coolant has been changed to green antifreeze, the stains will usually be real white or dark green depending on the brand and the severity of the leak.
If there are no leaks or stains in this area, then look around the water pump area for the same things. The radiator or coolant hoses (including heater hoses) could also be leaking. If it is stinking when the engine is hot, then you could get it hot then shut if off and look for steam.
TIP: A bright LED flashlight works really good for locating steam.
Posted on Jun 18, 2011
SOURCE: 95 Lumina 3.4 DOHC, 137k.
The first thing is to locate the coolant leak, you will need to pressurize the cooling system to locate the leak. these cars are famous for intake leaks, coolant and oil so take a good look at the intake where it meets the head, if theres coolant getting into the cylinder that may be the cause of the misfire. good day.
Posted on Jun 19, 2011
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