WHY do the windows inside the car freeze?
Windshield icing is caused by the fact that the glazing is always warm when the engine is on and the air conditioning system is running. After the engine is turned off, the windows begin to cool.
Since the windshield is tilted, the cooling process is faster than the rest of the glazing. As a result, the moisture vapor that is present inside the cabin turns into an icy crust, and the windshield frosts up from the inside first.
