You know what - I am doubting what I said, because today it was timed to come on and the car was cold. The times when it was warmed up is when I went out before breakfast and without turning on ignition I held the on/off button on the HVAC controls until it came on, set both side to HI and locked up and went back inside. When I do this it is very warm 20 minutes later, but doesn't seem to be the case when on the timer - it comes on but seems to have little effect.
Not enough fuel to test now it is disabled when the low fuel warning is on.
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