Hi all, need some guidance please. The direction control buttons on my heater panel don't work, the heater is stuck on demist mode so only get air to the windscreen. If I press the button to select face or footwell distribution nothing happens, the heater continues to blow the air on the windscreen despite the panel light showing I have selected face/footwell. Does anyone know what the problem could be? If it makes a difference my P38 has the manual heater control panel with rotary knobs to control temperature and fan speed and has no air con. Thank you