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hey guys! Need some help. My duramax is running great but noticed a small leak at the drain plug on the oil cooler. Might be the drain plug seal but not sure. May be coming from the weep hole. No other coolant leak that I can find. Definitely slowly losing coolant. Anyone have this problem? Thanks!
I think the coolant is coming from elsewhere...
Are your hoses hard when /after you have the engine running?
I have a lb7 that has excessive pressure in the hoses,i think...
But the point is it had numerous small leaks in the system because of the excessive pressure.I tightened all the offending clamps and the leaks disappeared,pretty much.
My truck is parked 98% of the time,it is a tow truck in a small town.So the issue hasn't made it's way to the top of the list.I add some coolant every 6 months or so depending on use.
On mine,my guess is an injector tube is leaking.
An uneducated guess based on what i have read here,i have never been inside a Dmax.
I agree with Yukon in that the leak is uphill from where you're seeing it. Maybe a turbocharge coolant hose?