Hi all. Does the autocruise starspirit 2004 have a thermostatic control apart from the one on the switch selector. I've turned it down low to high at different times. When selecting heating, red light on, I can't feel anything coming through the vents. When switching to cold air blow, it works fine. I've listened to the start up on both selections and the fan seems to fade away on heating mode. Plenty of diesel in my tank too. TIA for any solutions. Nigel.