cadillackid
Senior Member
Air shutters don't help when the thermostat is closed, and having all the heaters (...) on don't help the engine to warm up. Anyway, just my thoughts and your engine![]()
the webasto does
air shutters help hold the heat after you have driven o nthe freeway themn are driving in town.. you now have your radiator tanks full of hot water to use until the thermostat closes again