Mondeo cabin Temperature control - landyman
Hello all of you out there this is my first time.

I have a 98 Mondeo 2.0 ghia X, after using the cool setting and air conditioning all summer I now find that I can\'t select warm air, every other aspect of the heater A/C seems to be working, I have all fan speeds and can direct the flow of air to feet face etc. I have removed the control dial which is a variable resistor, which seems to be functioning correctly, I\'ve brought the appropriate haynes manual but can\'t find this control on any of the wiring diagrams in order to trace the fault, what does it control? flap or valve or somthing else? would appreciate any Help!
 

Value my car