I have a 2011 Chevy suburban LTZ (4 wheel drive). I’ve googled, I’ve YouTubed it, and I can’t find anything (or searching wrong) what do I need to do to get the defroster to work? coolant? Fuse? Or both? I don’t want to take it to a mechanic, if it’s something I can do a quick fix. Im not mechanically inclined haha. Thanks!