oh ok, thanks. I must have misread then. So the heater control valves are controlled by electrical pulses which are determined by the left and right temp controls. Is that correct then? If that is the case and the air con is switched on by the snowflake button then no coolant should be flowing to provide heat out of the vents? This is why I wanted to see a diagram. I will check my bmw book. cheers

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2005 X5 4.4i M Sport
2003 X5 4.4i