hi I mainly question, because I have exhausted all options I have a Citroen C5 2.0 HDI 2006 The main problem is two-zone air conditioning and before you proceed me to browse the forum, let's just say in my defense that I have known this is a problem in the Citroen C5. as you can imagine the passenger side - cooling does not work. and I removed the drawer - Engine flap is functioning - Fuses are all running - check under the steering wheel and in the engine compartment. - Plastic gears on the engine, the groove of the flaps and the interface are not damaged - Flaps after examining is not broken, because when moving sound is heard when it comes from one position to another, I also tested by blowing. The car was hot and the ambient temperature was 19 ° C, and so when I lift and decrease the temperature of the switch, it also showed on blowing checked with a thermometer. problem is in the activation of air conditioning so please if anyone could explain a little more,about this principle of activation