It is moist air being sucked in by the charge air cooler is what it is called Can’t remember the brand I think it was called cloud rider but I got a full stainless steel winter front for $200 Canadian from my local Chevy dealer aftermarket part
Mine had the same problem the issue is the inter cooler sucking in moist air and the. Freezes off the only solution which I can confirm worked for me is an aftermarket winter grill cover for the inter cooler in freezing conditions was about $200 Canadian for a starless steel winter front
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