Heating, air conditioning system

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety precautions when working on air conditioning systems
  1
• 1.2 Safety measures when working on vehicles with a start/stop system
  1
• 1.3 Safety precautions when working on the cooling system
  1
• 2 General information
  3
• 2.1 Notes concerning odours in air conditioned vehicles
  3
• 2.2 Notes for vehicles with start-stop system
  3
• 3 Repair notes
  4
• 3.1 Working on refrigerant circuit
  4
• 3.2 Refrigerant circuit seals
  4
• 3.3 Notes on control motors
  5
• 4 Technical data
  11
• 4.1 Capacities for refrigerant R134a
  11
• 4.2 Refrigerant oil
  11
• 4.3 Oil distribution
  11
• Heating
  12
• 1 Overview of fitting locations - heating
  12
• 2 Heater
  14
• 2.1 Assembly overview – heater unit
  14
• 2.2 Removing and installing heater unit
  15
• 2.3 Dismantling and assembling heater unit
  19
• 3 Control motors
  20
• 3.1 Removing and installing air distribution flap actuator
  20
• 3.2 Removing and installing temperature flap actuator
  21
• 3.3 Removing and installing flexible shaft for air distribution
  21
• 3.4 Removing and installing Bowden cable for temperature flap
  22
• 4 Air duct
  24
• 5 Operating and display unit
  25
• 5.1 Removing and installing operating and display unit
  25
• Air conditioning system
  27
• 1 Overview of fitting locations - air conditioning system
  27
• 2 Refrigerant circuit
  33
• 2.1 System overview - refrigerant circuit
  33
• 2.2 Assembly overview - condenser
  34
• 2.3 Removing and installing high-pressure sender G65
  34
• 2.4 Removing and installing expansion valve
  35
• 2.5 Removing and installing condenser
  38
• 2.6 Removing and installing receiver
  40
• 2.7 Removing and installing desiccant bag or cartridge
  42
• 2.8 Removing and installing evacuating and charging valves on low and high-pressure side
  43
• 2.9 Commissioning of air conditioning system after filling refrigerant circuit
  45
• 3 Air conditioner compressor
  46
• 3.1 Assembly overview - drive unit of air conditioner compressor
  46
• 3.2 Assembly overview - pulley
  47
• 3.3 Removing air conditioning compressor from and installing on bracket
  48
• 3.4 Removing and installing air conditioner compressor
  50
• 3.5 Checking high-pressure safety valve on air conditioner compressor
  54
• 3.6 Removing and installing pulley
  54
• 4 Control motors
  57
• 4.1 Removing and installing temperature flap control motor V68
  57
• 4.2 Removing and installing defroster flap control motor V107
  60
• 4.3 Removing and installing air recirculation flap control motor V113
  61
• 4.5 Removing and installing left temperature flap control motor V158
  64
• 4.6 Removing and installing right temperature flap control motor V159
  66
• 4.7 Removing and installing fresh air/air recirculation, air flow flap control motor V425
  67
• 4.8 Removing and installing front air distribution flap control motor V426
  69
• 4.9 Removing and installing air distribution flap control motor V428
  70
• 4.10 Removing and installing fresh air/air recirculation, air flow flap actuator
  70
• 4.11 Removing and installing flexible shaft for air distribution
  71
• 5 Front heater and air conditioning unit
  72
• 5.1 Assembly overview - heater and air conditioning unit
  72
• 5.2 Assembly overview - evaporator housing
  79
• 5.3 Removing and installing evaporator
  79
• 5.4 Checking auxiliary air heater element Z35
  80
• 5.5 Removing and installing auxiliary air heater element Z35
  81
• 5.6 Removing and installing heater and air conditioning unit
  82
• 5.7 Removing and installing air distribution housing
  87
• 5.8 Removing and installing dust and pollen filter
  88
• 5.9 Removing and installing fresh air blower V2
  89
• 5.10 Removing and installing fresh air blower control unit J126
  89
• 5.11 Removing and installing heat exchanger
  90
• 5.12 Removing and installing evaporator temperature sensor G308
  98
• 5.13 Removing and installing baffle plate
  99
• 5.14 Removing and installing fresh air blower series resistor with overheating fuse N24
  99
• 5.15 Removing and installing evaporator output temperature sender G263
  100
• 5.16 Checking condensation drain
  101
• 5.17 Removing and installing glove box cooling
  101
• 5.18 Removing and installing filter unit
  102
• 6 Air duct
  103
• 6.1 Removing and installing driver side footwell vents
  103
• 6.2 Removing and installing front passenger side footwell vents
  103
• 6.3 Removing and installing rear footwell vent
  104
• 6.4 Removing and installing forced ventilation for passenger compartment
  104
• 6.5 Checking forced ventilation for passenger compartment
  105
• 6.6 Removing and installing fresh air intake
  106
• 6.7 Removing and installing rear vent
  108
• 6.8 Removing and installing centre vent
  108
• 6.9 Removing and installing driver or front passenger side air vents
  108
• 7 Operating and display unit
  110
• 7.1 Overview of operating and display unit
  110
• 7.2 Removing and installing operating and display unit
  118
• 7.3 Multi-pin connector pin assignment on back of operating and display unit
  121
• 8 Other controlling and regulating components
  127
• 8.1 Removing and installing sunlight penetration photosensor G107
  127
• 8.2 Removing and installing photo sensor 2 for sunlight penetration G134
  128
• 8.3 Principle of operation of air quality sensor G238
  128
• 8.4 Removing and installing air quality sensor G238
  130
• 8.5 Removing and installing ambient temperature sensor G17
  131
• 8.6 Removing and installing left vent temperature sender G150
  132
• 8.7 Removing and installing right vent temperature sender G151
  132
• 8.8 Removing and installing centre vent temperature sender G191
  133
• 8.9 Removing and installing footwell vent temperature sender G192
  134
• 8.10 Removing and installing left footwell vent temperature sender G261
  134
• 8.11 Removing and installing right footwell vent temperature sender G262
  135