Coolant pre-heater

[Poodle]

It'll take a few minutes to get up to full operating temperature, but if the coolant preheater is working you should have some warm air within a minute or so - not hot, but warm enough to clear the screen.

I seem to remember Cully also mentioned something about the normal glowplugs pulsing during warm-up to help heat the engine, possibly only when it's below freezing, i don't quite remember.

I've heard a about aircon helping produce warm air earlier, but i don't know how accurate that is nor can i work out how it would work... Something i see a lot on newer cars is a heatshield about the exhaust manifold with a draw pipe that feeds into the in-car heater, produces hot air in less than a minute and shouldn't be too hard to replicate...