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Ah ok cheers. Is there any benefit to this? I guess the air is potentially warmer than the outside air already?
AlexD-
It keeps the fetid warm air inside the car if that's what you want. It also keeps the air conditioned air inside so that you can cool it quicker. In most cars with the A/C on it boosts the output of the fan but not always when you have it on the windscreen.
Theoretically it could keep out stinks. -
Is there any benefit to this?
Faster heating (or cooling, if you have AC) of the cabin. The disadvantage on cold days is that humidity builds up (occupants generating water vapour), so your windows mist up more.
Constable_Savage
gbj_tester
Air recirculation. It takes cabin air and pushes it through the heater, rather than taking fresh external air.