i posted this about a year ago and still trying to sort this problem! my climate control only blows hot whatever the settings( dual zone controls) and their isnt any control of the recirculation door either, i removed the blend door motor on the passenger side and checked the voltage to it, at cold setting it was 0.23v going up to 0.45v when set to hot on the control panel, the motor turns freely and seems in good condition, does anyone know what voltage they should operate at? does seem quite low? is the climate control panel a known weak spot on the 300c? after googling this fault seems a few people have to have them replaced, any ideas much appreciated! 300c is a uk model wagon 3.5, 2006, 69k miles.