Sounds to me like the switch
There are two wires from the switch
green/yellow pos 1
green pos 2
This suggests that "green/yellow pos 1" is live as soon as the ignition is turned on as well as when the switch is actually in Pos 1.
Check if it is also live when the switch is in Pos 2.
Try temporarily swapping out the switch, even just to an on/off switch. If the heater doesn't come on when the temporary switch is off but does when it is switched on then it is definitely your switch
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