[Goat Blower]

If you have the heater set on circulating flow, instead of recirculating flow and you still have frost, check the vents towards the rear of the car. If you have a 1G, there are small flaps behind the plastic panels just behind the front seats, it allows air to circulate back out of the car through the small vents on the bump strip on the rear quarter panel. Most cars have them further back in the trunk behind the cloth panels.