2015 suburban coolant disappears

[Chris45]

Hi all. I’m new! I have a 2015 suburban that has coolant “disappearing”.  Had to the dealer 2-3 times, they pressure test and find nothing. I’m really frustrated! I just had to add coolant to it. Any suggestions...?

[newdude]

Any coolant around the perimeter head bolts? 

[Chris45]

I personally haven’t looked but now that you bring it up, I’ll check it this afternoon.  Just pull off the plastic covers to see head bolts correct?

[Sierra Dan]

With the '14 Silverado and Sierra, some radiators were cracking on the sides where aluminum and

plastic meet. Engine coolant was seeping/venting out.

It was an obvious smell in the front grille area and the reservoir would go down below the cold fill mark.

Happened to mine and dealer replaced radiator. It was caused by a cycling thermostat.

All was updated to new parts. There is a TSB out there regarding the issue.

[Chris45]

Thanks Sierra Dan! With that leak, did the truck leave any fluid on the driveway/ground?

[Supreme Pizza]

Pull the transmission dipstick and make sure its not ending up in there.

[Chris45]

Ok Starman. Just to clarify, the theory is that the coolant is getting in there from a leak internally in the radiator, between the engine coolant tanks, and transmission lines

 

[Supreme Pizza]

Its unlikely, but it is possible. Any time I see an unexplained coolant loss, I start there. If you catch it quick enough, you can save the transmission. That problem is MUCH more common on Nissans though. Drive it around the block, and pull the transmission dip stick. Is the fluid over full, or cloudy? 

[Chris45]

great! thanks for the tip.  When the wife gets home, ill go out and do just that.

[mjm-1957]

Changing alot of radiators lately for cracked side tanks.The TSB says to replace the thermostat at the same time to prevent thermocycling .Take a look at the tanks on yours.

[Chris45]

Any particular place on the tanks? Meaning, do they appear to be cracking in one spot more than another?

[chrispassas21]

My 2015 silverado 1500 seems as if it is loosing coolant as well...


2015 Silverado LT Midnight Edition
4.5” CST suspension lift
Sent from my iPhone using Tapatalk

[Chris45]

That’s what mine is doing only mine isn’t getting that low.

[chrispassas21]

That’s what mine is doing only mine isn’t getting that low.

I guess I’ll fill her up and check the areas these guys said to look at. Other than that I hate to say it but I might have to take it to stealership


2015 Silverado LT Midnight Edition
4.5” CST suspension lift
Sent from my iPhone using Tapatalk

[Chris45]

Ditto...at least mine is under warranty...-100 deductible