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I have an external coolant leak between intake manifold and head

3 litre engine

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Ok, well, sounds like a bad gasket. If you don't want to replace it, I have had fairly good luck using Barrs Stop-Leak.

Posted on Apr 03, 2015

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Posted on Jan 02, 2017

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Hello roxanna surf: My name is Roger and I will help you. The problem could be one of several problems. GM has a problem with the intake manifold gaskets leaking coolant useually external but can leak internal also. Check at the corners of the intake manifold where the manifold meets the heads. If you see green or orange drops of coolant or a slimmy build up than the intake manifold gasket is leaking. Idf the leak has been ongoing for some time and the engine has overheatedI would also look at a head gasket, warpped head or even a cracked head as a source of the problem. The engine does not like extreme heat and can have serious issues. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

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Most likely internal head gasket leak, all 3.1L and 3.4L engines are notorious for intake gasket (external leak can be seen on either side of engine intake manifold) or head gasket leaking (usually internally). If it goes thru coolant and there is no obvious leak on the ground than its internally burning the coolant. If leaking on the ground check below water pump while running, it may be leaking also. Ultimately its probably head gaskets.

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Notorious problem with coolant leaking @ the intake manifold. Have the cooling system pressure tested to locate source.

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