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Steve, ASE Certified Tech
Category: Car
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Experience:  25 years working as a service technician
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GMC W4500: isuzu

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It could be just a head gasket this is the most common concern for your problem. You will need to remove the head and inspect the head gasket for any tears or concerns. if the head gasket is ok then send the head out to a machine shop to check the head for a concern.


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Steve and 2 other Car Specialists are ready to help you
Hi Etan,

I'm just following up with you to see how everything is going. Did my answer help?

Let me know,
Customer: replied 3 years ago.

I thoght like you, But it turned out to be the oil cooler on the side of the engine

I am glad you figured it out.
Have a great day

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