Check the switch for turning on the front window and heater fan. turn it clockwise to turn on the fan, PULL THE SAME SWITCH OUTWARDS to switch on the rear window heater. The light in the centre of it with the heater symbol on it should light up. Push it in again to switch it off, and do not use it when the engine is not running. It uses a lot of power and could flatten your battery if it is on for any time.
Macdonald, November 2007