Coolant leak.

[JMH1980]

Hi guys.
Today I am replacing the oil cooler lines on my 2016 Yukon 6.2 L.

I have had a very slow coolant leak, maybe half inch to an inch drop in reservoir level between oil change intervals. I found evidence of coolant on this transmission cooler line in the picture, but no evidence of it leaking anywhere else. Wouldn't there only be transmission fluid inside this line ?

Any thoughts are appreciated. Thanks

 

[2017sltXL]

Hi guys.
Today I am replacing the oil cooler lines on my 2016 Yukon 6.2 L.

I have had a very slow coolant leak, maybe half inch to an inch drop in reservoir level between oil change intervals. I found evidence of coolant on this transmission cooler line in the picture, but no evidence of it leaking anywhere else. Wouldn't there only be transmission fluid inside this line ?

Any thoughts are appreciated. Thanks

Were you able to nail down the leak?
It's possible it's migrating from the radiator area onto those trans lines.

 

[OR VietVet]

Or from the water pump.