Coolant loss on 2005 3.4L v6 - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-16-2016, 08:19 PM   #11
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I would also recommend a coolant pressure test.
When it comes to questioning a possible interior coolant leak, a gas engine oil analysis, would also confirm or deny the presence of coolant in oil.
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Old 02-17-2016, 05:13 AM   #12
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Thanks again WilliamE and Soft ride.

I will take your advice and pressure test the system. I am assuming that if there is a defect in the lower intake manifold gasket allowing coolant into the combustion chamber while the engine is running that with engine off and the system pressurized for an extended period of time (say a couple hours) that the coolant would be forced into one of the cylinders via the intake manifold.

Assuming that this happens I should be able to pull the plugs and rotate the engine which should expel "dyed" coolant from the affected cylinder. Allowing me to confirm an intake gasket problem.. Does this sound reasonable???

If this test does not reveal any coolant leakage into any of the cylinders my next step will be an oil sample..

I will keep you posted Thanks again... John
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Old 02-17-2016, 06:53 AM   #13
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Yes, matter of fact that is a good idea if you lose coolant but cannot trace it, a lot better than starting the car and risking ruining the motor.
If you are losing coolant, you'd pull all plugs, and crank it by hand, if you can tell there is fluid/coolant in the cylinders then I'd go ahead and do the LIM job, and change the oil.
There are but so many places the coolant can go, if no external leaks are visible my money is on the LIM Gasket, I have seen them fail as early as 50k miles, mine made it to 133k, a good part of the gasket disintegrated as I removed it, it was bad.
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Old 02-17-2016, 10:12 PM   #14
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I think I found the leak!!!
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Old 02-17-2016, 10:58 PM   #15
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Where does it seem to be leaking from?
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Old 02-17-2016, 11:28 PM   #16
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Sorry for the last post. I messed something up.
After performing the pressure test (which was recommended by many of you) I noticed a drop or two of coolant on my "poor man creeper" (cardboard). I did not have much time to look into it but after I crawled underneath the vehicle I found a small trail of dyed coolant on the lower plastic cowling and looks to be coming from the lower radiator hose of the radiator itself. This leak is not visible from above the engine compartment and could have been easily overlooked by me as the bottom of the van is covered with snow and road slop.

Tech II!! thanks for this in one of your earlier posts.

"Dye is your friend, especially, when it is a small leak."
I am confident I would have not have found this leak without the dye and persistence.

Assuming this is my problem I will dig into this tomorrow and let you know what I find..
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