Hi David
As stated above if Terry as looked at it then you have one the best guys whom knows his way round these cars.
As the fan been checked to see if it as a silver or gold resistor fitted by visually looking through the front grill at about 14.00 hours.
Because as Tom as suggested it sounds like that a three speed fan is fitted and may have been tampered with ? sounds like the medium speed is kicking in for the low speed, best to do as TC says and check the demist test out, start engine make sure all the A/C is off press demist button only and check through the front grill that the fan is running continuously.
If not then the low speed as failed, or the silver resistor as failed if it is a 2 speed fan.
With the coolant having to be added and no leak found I would be inclined to re-bleed the system making sure the header tank is raised as I high as possible while doing so then get back to us.
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