I would wait until you have coolant loss before you report.
Apparently there is no dealership back to GM reporting on this. My coolant had vented down to about a quarter inch below the bottom of the arrow. Topped off with no questions. I did discuss putting a thicker o-ring on my pressure cap (lower o-ring) but they didn't have one that was 4.5mm thick. The o-ring on our caps is 4 mm thick and I know for a fact, based on coolant residue in the vent channel, that my coolant loss is through the pressure cap.
Basically this item is simply to instruct dealerships to just refill the surge tank without charging for the coolant.
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Interesting... at the very least the problem seems to be on their radar. I wonder if some of those class action suits have anything to do with this?
For anyone interested, my thicker o-ring fix has been in my car for quite a while now and coolant level is holding steady. PM me for details if interested, but since this is getting the General's attention (finally) you may wish to hold out on a DIY fix until whatever comes of this takes place.
For the record, my car lost coolant (venting through the cap) until I paid out of pocket to buy a new surge tank that didn't have a manufacturing defect in the cap throat, and installed a thicker o-ring to increase the seal load between the cap and tank. It is actually very slightly over-filled by about 1/8" (topped it off on a non level surface) and it's not leaking or venting at all.
Fingers crossed that this leads to a fix.
Interesting ..... I should check my coolant levels as well.
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I just checked the website for my car after reading this. That make me go check my car. (This is the first time I've been thinking about it while the car is cold 😂. Sure enough, mines really low! Almost below the pipes! It has an appointment at the dealer tomorrow anyways I'll bring that up with them too while it's there.
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