@ 182,000 kms noted to be my first oops moment with Volt #4. I noticed at work, a small coolant spot near driver side of radiator, in fact, there is 3 of them but anyway. Went back to home without after thought, since no error message, should be a slow leak... Except next morning, the car didn't recharge at night and now has a " Service High-Voltage Charging System" error message + CEL. Pop up the hood the drive battery coolant reservoir (there is 3 too) was almost empty. I had some Dexcool laying into my basement so, i filled it up before calling my preferred Chevrolet dealer to inquire about availability, they answered me bring it in, we have a Volt loaner awaiting for you, we'll try to look at your Volt next week in between or no show appointment. Sound good enough for me, I dropped my 2014 Volt and drove back into 2017 Volt with almost 150k kms, it was fully recharged and this Sunday morning, I gave it a wash.
Now wait & see for the bill estimation.