I bought my lbz 2 weekends ago and I discovered that it is dripping a little coolant from the back of the motor. It won't leak when the truck is hot. I ordered some Irontite all season sealer but my dad has been a mechanic at delta for 26 years and he said don't add it in or else it will cause other problems. What is everyone's opinion???
Do not use sealer-- your dad is correct. Plug heater core and other passages.
Remove the air intake from the Turbo and inspect- may be a turbo cooler hose or etc.
A leaky head gasket on a Duramax will usually show pressure in the cooling system-top radiator hose firm like a tennis ball, [after driven hard, and sat overnight]
Hopefully so. I got it pressure tested and everything was fine. It lost a tad bit of pressure but not much. Didn't leak tho. I've noticed it does not leak when it's hot
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