- Jan 8, 2018
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Hey everyone, I'm hoping to get some help with diagnosing the coolant leak on my 2011 Denali. I noticed the coolant level was pretty low in the tank and filled it up. I went out for some lunch after and when I came back out to the truck, it looked like someone basically poured out a new bottle of coolant under the engine. It has been parked for over a week and it is still slowly leaking. It is coming from above the oil drain plug (photos below). I am hoping this is something I can fix myself as I don't really have the extra funds available after Christmas to take this in to get done. Any help is greatly appreciated. Thanks!