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LoveTwoCamp's avatar
LoveTwoCamp
Explorer
Jul 07, 2013

Oily residue on top left side of radiator cover--what is it?

This is a 2004 chevy diesel truck. Several months ago, I had the truck into the dealer for another issue, and saw this "residue" and asked them to check it out. They said that they did not know what i...
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wintersun's avatar
wintersun
Explorer II
Jul 07, 2013
With a 2004.5 with the LLY engine I would suspect the head gasket is bad and have it checked out fully before driving the truck. Known problem with the early production LLY engines and much more expensive a repair if coolant gets into the crankcase.

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