Is My Coolant low?

[JayceeP]

Was checking the oil on my 2024 Yukon XL and had a look at the coolant reservoir in the first 2 pics (Engine Coolant Surge Tank). Is this too low? It’s a long weekend here so I’ll reach out to the dealer in the am. Hitting the highway later this week so trying to get answers asap.

It was this level a couple weeks ago but I forgot to follow up on it.

The 3rd pic, Charge Air Coolant Surge Tank, does look good however. Not sure how one ties into the other. Assume the Charge tank being full is more important?

 

[Stbentoak]

I had seen this on mine maybe a couple of years ago. I filled it up above the cold mark with the appropriate coolant and it's pretty much been good ever since. There could have been a one-time reason why it got low. I wouldn't read a whole lot into it unless it's taking it down to the bottom on the regular.

 

[StephenPT]

A little bit but not alarming. You can top it off with distilled water - or buy 50/50 DexCool premix.

You want the engine coolant reservoir right at the middle seam - kind of hard to see when it's at that level, but as long as you don't see the coolant level below the seam, you're fine.

The CAC coolant level should come up a bit so it's touching the point on those two arrows.

FYI - the two coolant systems are completely independent. Engine coolant loop handles the engine and oil cooler. CAC coolant loop handles the CAC and transmission heat exchanger.

 

[JayceeP]

A little bit but not alarming. You can top it off with distilled water - or buy 50/50 DexCool premix.

You want the engine coolant reservoir right at the middle seam - kind of hard to see when it's at that level, but as long as you don't see the coolant level below the seam, you're fine.

The CAC coolant level should come up a bit so it's touching the point on those two arrows.

FYI - the two coolant systems are completely independent. Engine coolant loop handles the engine and oil cooler. CAC coolant loop handles the CAC and transmission heat exchanger.

This stuff look right? It says 50/50 pre-mixed. But also has anti-freeze?

 

[Scarey]

Great info, I assumed one was an expansion/overflow. I had no idea they’re two separate loops. I to am curious about brand/type of coolant?

Separate question, I was very surprised to see the 3.0 runs on 0-20 oil. I assume it’s different than the gasser 0-20? 0-20 diesel specific?

 

[Stbentoak]

DexosD.. many flavors available. Just as cheap as 6.2 oil.....

 

[StephenPT]

This stuff look right? It says 50/50 pre-mixed. But also has anti-freeze?

Yep - that stuff is compatible with the factory filled coolant. 50/50 means 50% distilled water and 50% ethylene glycol (aka anti-freeze).

 

[JayceeP]

Thanks guys - appreciate the help!