Question about 2005 GMC Sierra Denali

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Coolant leak 05 denali - 2005 GMC Sierra Denali

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I will assume as usual that it has the 5.7L engine. The common cause for a coolant leak in these truck are the intake manifold. It either leaks externally or internally or both this is a common problem with this engine. You have to replace the intake gaskets. This a fairly big job. First check your engine oil if the level has risen and if the oil smells like anti freeze or looks like a milkshake kinda foamy then the chances are good that your intake is leaking.If all else fails you will have to do a coolant pressure test and you will seee the leak probably.It could also be your cylinder head gaskets but the most likely cause is the intake gasket. $100.00 for the gasket kit and about 5-6 labour. Change your oil & filter before you start it after you replace the gaskets. Then if your leak goes away change your oil & filter again about a week later to ensure you get all the coolant out of the engine oil this is very harmfull to the bearings in the engine.

Posted on May 04, 2011

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Posted on Jan 02, 2017

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Andy

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SOURCE: My friend's 04 Denali 6L is leaking coolant. I

probably the water pump. front and center of the engine, the pulley that may or may not have the cooling fan attached. from under the truck a leaking water pump usually leaves some coolant residue on the timing cover and at the front of the oil pan where the wiring harness come across.

Posted on Jul 27, 2011

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