AIR CONDITIONING

(if equipped) stationary heater button
(under rear of center console) (w/ rear air conditioning) rear blower motor
(w/ stationary heater) climate control menu & residual heat on/off button
(w/o stationary heater) climate control menu button
(w/o stationary heater) residual heat on/off button
Air recirculation mode button
Defrost/ heated windshield button
Front climate control operating unit
Left auto button
Left blower button
Left rear air conditioning heat exchanger temperature sensor (left rear of rear a/c heat exchanger assembly)
Left temperature selection button
Nca
Pnk
Rear air conditioning evaporator shutoff valve (rear of center console)
Rear air conditioning evaporator temperature sensor (lower left side of evaporator)
Rear window heater button
Red
Right auto button
Right blower button
Right rear air conditioning heat exchanger temperature sensor (right rear of rear a/c heat exchanger assembly)
Right temperature selection button
W18 (under driver's seat)
W34 (left front footwell)
X18/35-c1
X18/35-c2
X53/1-c1
X64/10-c1

(left rear side of rear blower assembly) left rear center air outlet actuator motor
(left upper end of dash) left a-pillar air distribution actuator motor
(right rear side of rear blower assembly) right rear center air outlet actuator motor
(right upper end of dash) right a-pillar air distribution actuator motor
(under left driver's/front passenger's seat) (w/ comfort automatic air conditioning) left b-pillar air distribution actuator motor
(under left driver's/front passenger's seat) (w/ rear air conditioning) left b-pillar air distribution actuator motor
(under rear of center console) (w/ comfort automatic air conditioning) rear blower motor
(under right driver's/front passenger's seat) right b-pillar air distribution actuator motor
A v fond vdf
Ac water valve (center rear of engine compt)
Climate control control unit (right side of dash)
Kmv rv
Nca
Pnk
Red
Refrigerant pressure sensor (bottom left side of radiator assembly)
Vdf tmp fond
Wav ausg a
Wav ausg b
Wtt fond l
Wtt fond r
Wtv fond l
Wtv fond r
X18-c1
X18/28-c1
X18/35-c2
X53/1-c1
X81-c1

(in left hvac footwell air outlet vent) left footwell air outlet temperature sensor
(in left hvac side air outlet vent) left side air outlet temperature sensor
(in right hvac footwell air outlet vent) right footwell air outlet temperature sensor
(in right hvac side air outlet vent) right side air outlet temperature sensor
(lower left side of evaporator) evaporator temperature sensor
(right rear of engine compt) rear heating system valve unit
Coolant circulation pump
Engine fuse & relay module (left rear of engine compt)
Fuse 15a
Hot w/ circuit 87m relay energized
Left center air vent potentiometer
Left duovalve
Left rear center air vent potentiometer
Left side air vent potentiometer
Nca
Pnk
Red
Right center air vent potentiometer
Right duovalve
Right rear center air vent potentiometer
Right side air vent potentiometer
Sun sensor (top center front of dash)
W18 (under driver's seat)
W2 (right front of engine compt)
X122/8-c1
X18-c1
X18/28-c1

(left side of hvac unit)
(upper right front side of hvac unit)
A t kwths
Activated charcoal filter shutoff valve
Air recirculation flap actuator motor (left side of hvac blower housing)
Akv
Can-c h
Can-c l
Computer data lines system
Coolant temperature sensor
Coolant thermostat heating element
E a tanss
E a tmot
Fresh air/ram air flap actuator motor (upper left front side of hvac blower housing)
Left center air outlet flap actuator motor (upper left front side of hvac unit)
Left defroster vent flap actuator motor (left top side of hvac unit)
Left footwell flap actuator motor (left lower center front side of hvac unit)
Left side outlet flap actuator motor (upper left side of hvac unit)
Lower left blending air flap actuator motor
Lower right blending air flap actuator motor (right side of hvac unit)
Me-sfi (me) control unit (top center rear of engine)
Nca
Ptc heater booster (in hvac unit)
Purge control valve (left side of engine compt)
Red
Right center air outlet flap actuator motor
Right defroster vent flap actuator motor (right top side of hvac unit)
Right footwell flap actuator motor (right lower center front side of hvac unit)
Right side outlet flap actuator motor (upper right side of hvac unit)
Upper left blending air flap actuator motor (left side of hvac unit)
Upper right blending air flap actuator motor (right side of hvac unit)

AIR CONDITIONING – Mercedes-Benz S550 2014 – SYSTEM WIRING DIAGRAMS