Mystery coolant leak

[RedneckLimo88]

hey guys, was wondering if anyone with a 2015-2020 Denali with the 6.2 has noticed a loss of coolant, but cant track the leak. i have check all hose connections, water pump, gaskets, i cant find out where the coolant is going. nothing drips. i did find slight saturation on the lower passenger side of the radiator but the hose is dry on the outside. i have to fill roughly 8oz every 1000 miles or so.

 

[B-train]

Nothing I can think of off the top of my head outside of the usual. I'd get a strong flash light and look for white (maybe whitish-pink) residue anywhere near connection points, radiator tank ends, behind the front splash guard, etc. A lot of times slow leaks evaporate and never leave any evidence other than dehydrated remnants.

Also, if you live in a salt use area, the coolant lines along the frame rail can corroded at the hangers.

 

[RedneckLimo88]

Nothing I can think of off the top of my head outside of the usual. I'd get a strong flash light and look for white (maybe whitish-pink) residue anywhere near connection points, radiator tank ends, behind the front splash guard, etc. A lot of times slow leaks evaporate and never leave any evidence other than dehydrated remnants.

Also, if you live in a salt use area, the coolant lines along the frame rail can corroded at the hangers.

i went back out and cleaned very well on the passenger side and found a slow drip coming down the side of the radiator. not sure EXACTLY where it is coming from but its definitely on that side. i had something similar happen on my 16 2500 Silverado. cracked on the polymer casting on the side of the radiator. looks like im putting another radiator in. Ebay ALuminum here i come...

 

[89Suburban]

Side thank on the radiator is probably weeping.

 

[OR VietVet]

Welcome to the forum from Oregon.

Sure sounds like a radiator tank problem like @B-train and @89Suburban said.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

Radiators cracking on the ends over time is a common occurrence on these trucks.