Like the title says, I'm trying to figure out the best way to keep the front defroster running while I am clearing ice/snow from my car. When I leave work, I will start the HVAC, but obviously can't start the defrosters until I am at the car. Two days ago come out at 7 am with 4 inches of snow on top. I leaned in, turned on the front, rear, and wiper defroster and started clearing snow. I even left the keys on the drivers seat in case this would trigger it. Once I got the car clear and get back in, the rear defroster is still running but the front has turned off. Is there anyway to force it to stay on while I am scraping?