Dumb-ass heater question.....

[popcorn balls]

Connected the heat exchangers up today - Never had a bus with working heaters before and got to say i'm impressed, it's chucking out much more heat than i expected.

However i don't really know what the four lever controls do The coloured ends are missing too - so give me a run down left to right please.....

 

[Cali_bay]

This is the setup on my bus.

Left (red) - LH rear heater flap
Next (red) - RH rear heater flap (cross over model has switch to operate electric fan in engine bay)
Next (Blue) - LH front air flap
Right (blue) - RH front air flap