IHKR system operation is as follows:
Temperature Control - The desired interior temperature is set with the rotary knob on the control panel. Control of the interior temperature is carried out electronically by the con- trol module’s cycling of the water valve to regulate coolant flow through the heat exchanger.
Air Distribution - Air distribution is set mechanically through the use of gear linkages and bowden cables. The air can be set for:
Footwell or blended between footwell/face vent or footwell and defrost
Defrost or blended between footwell/defrost or defrost/face vent
Face vent or blended between face vent/footwell or face vent/defrost
Blower Control - Blower fan speed is controlled through a final stage with infinitely vari- able speed control.
The push buttons on the control panel are used to:
Switch between fresh air and recirculating air inlet modes
Request for A/C activation
Activation of the rear window defogger