if I start the car, move it on my drive and stop the engine, next time I come to start the only way to get it started is to put the throttle to the floor and keep turning the key, eventually it fires, is very rich but no warning lights and drives OK. No starting problems normally.

using defrost switch - all is fine
switch to face vents - fairly warm but not hot considering temp was at 29
switch to face and feet or just feet - fan cuts down and very little heat to feet eventuallly