So I used the defroster the first time last thursday, its apparently working fine, but the Driven Information screen keeps coming up with the Service Heater message. Called Onstar they said the diags are all clear, but I figure I better take it to the dealer anyways, its probably a software glich but rather know for sure. Planning on a big adventure trying to get the Bolt to Taos, NM and back along a long and mostly unpopulated route rom AZ. (According to my plan I'm gonna be having to stop 5-6 times to charge, ouch) Will be needing a working defroster for sure.