Originally Posted by Spudly
No more than lukewarm water or you may crack the screen dependant on how cold it is outside, and err do you sit and wait till your engine is at running temp before turning your blowers on?
No you dont, you turn them on and they blow cold and gradually warm up and the screen warms up gradually too, hence no crackage, if you left your screen frozen over and let the heaters get to full temp then bang em on full you might risk cracking the screen like in the advert but i dont know anyone that does that:p