Heating, air conditioner

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety precautions when working on air conditioning systems
  1
• 1.2 Safety measures for working on vehicles with high-voltage system
  1
• 1.3 Safety precautions when working in the vicinity of high-voltage components
  2
• 1.4 Safety measures when working on vehicles with a start/stop system
  3
• 1.6 Safety precautions when working on the cooling system
  3
• 1.7 Safety precautions when handling refrigerants
  3
• 1.8 Safety precautions for working on vehicles with auxiliary/supplementary heater
  4
• 2 General information
  6
• 2.1 Type plates
  6
• 2.2 Notes concerning odours in air conditioned vehicles
  6
• 2.3 Notes for vehicles with start-stop system
  7
• 2.4 Notes on dust and pollen filter
  8
• 3 Repair notes
  10
• 3.1 Rules for cleanliness
  10
• 3.2 Nuts and bolts
  10
• 3.3 Routing and attachment of lines
  11
• 3.4 Fitting radiators and condensers
  11
• 3.5 Checking heater output
  11
• 3.6 Checking cooling output
  14
• 3.7 Working on refrigerant circuit
  16
• 3.8 Paint work on vehicles with air conditioning system
  16
• 3.9 Refrigerant circuit seals
  17
• 4 Technical data
  18
• 4.1 Refrigerant capacity
  18
• 4.2 Refrigerant oil capacities
  18
• 4.3 Oil distribution
  19
• Heating
  20
• 1 Overview of fitting locations - heating
  20
• 1.1 Overview of fitting locations - components not located in passenger compartment
  20
• 2 Heater
  24
• 2.1 Assembly overview – heater unit
  24
• 2.2 Removing and installing heater unit
  25
• 2.3 Removing and installing flexible shafts
  31
• 2.4 Removing and installing temperature flap actuator
  33
• 3 Control motors
  35
• 3.1 Removing and installing fresh air and air recirculation flap control motor V154
  35
• 4 Air duct system
  36
• 5 Operating and display unit
  37
• 5.1 Overview of operating and display unit
  37
• 5.2 Connectors on controls for heated and fresh air
  39
• 6 Other controlling and regulating components
  41
• Air conditioning system
  42
• 1 Overview of fitting locations - air conditioning system
  42
• 1.1 Overview of fitting locations - components not located in passenger compartment
  42
• 2 Refrigerant circuit
  49
• 2.1 System overview - refrigerant circuit
  49
• 2.2 Assembly overview - condenser
  51
• 2.3 Removing and installing high-pressure sender G65
  52
• 2.4 Removing and installing expansion valve
  54
• 2.5 Removing and installing condenser
  57
• 2.6 Removing and installing desiccant bag or cartridge
  60
• 3 Air conditioner compressor
  82
• 3.1 Assembly overview - drive unit of air conditioner compressor
  82
• 3.2 Removing air conditioning compressor from and installing on bracket
  83
• 3.3 Removing and installing air conditioner compressor
  87
• 3.4 Checking high-pressure safety valve on air conditioner compressor
  95
• 4 Control motors
  97
• 4.1 Overview of fitting locations – front control motors
  97
• 4.2 Removing and installing temperature flap control motor V68
  99
• 4.3 Removing and installing centre flap control motor V70
  102
• 4.4 Removing and installing defroster flap control motor V107
  103
• 4.5 Removing and installing air recirculation flap control motor V113
  105
• 4.6 Removing and installing left temperature flap control motor V158
  109
• 4.7 Removing and installing right temperature flap control motor V159
  112
• 4.8 Removing and installing fresh air/air recirculation, air flow flap control motor V425
  114
• 4.9 Removing and installing air distribution flap control motor V428
  114
• 5 Front heater and air conditioning unit
  115
• 5.1 Assembly overview – heater and air conditioning unit
  115
• 5.2 Assembly overview – evaporator housing
  120
• 5.3 Removing and installing evaporator
  120
• 5.4 Checking auxiliary air heater element Z35
  122
• 5.5 Removing and installing auxiliary air heater element Z35
  125
• 5.6 Removing and installing heater and air conditioning unit
  129
• 5.7 Dismantling and assembling heater and air conditioning unit
  136
• 5.8 Removing and installing air distribution housing
  137
• 5.9 Removing and installing dust and pollen filter
  141
• 5.10 Removing and installing fresh air blower V2
  142
• 5.11 Removing and installing fresh air blower control unit J126
  143
• 5.12 Removing and installing heat exchanger
  144
• 5.13 Removing and installing coolant pipes on heat exchanger
  156
• 5.14 Removing and installing evaporator temperature sensor G308
  160
• 5.15 Removing and installing condensation drain
  161
• 5.16 Checking condensation drain
  161
• 5.17 Removing and installing baffle plate
  162
• 5.18 Removing and installing fresh air blower series resistor with overheating fuse N24
  163
• 6 Air duct system
  165
• 6.1 Assembly overview - air duct and air distribution in passenger compartment
  165
• 6.2 Air intake and air outlet openings
  167
• 6.3 Removing and installing driver side footwell vents
  170
• 6.4 Removing and installing front passenger side footwell vents
  171
• 6.5 Removing and installing rear footwell vent
  173
• 6.6 Installing plug in air duct to centre vent
  174
• 6.7 Removing and installing air ducts
  175
• 6.8 Removing and installing forced ventilation for passenger compartment
  175
• 6.9 Checking forced ventilation for passenger compartment
  176
• 6.10 Removing and installing fresh air intake
  177
• 6.11 Removing and installing air intake duct
  178
• 6.12 Removing and installing air duct for defroster vent
  179
• 6.13 Removing and installing air duct for centre dash panel vent
  180
• 7 Operating and display unit
  181
• 7.1 Overview of operating and display unit
  181
• 7.2 Removing and installing operating and display unit
  185
• 7.3 Procedure when checking and adjusting components
  187
• 7.4 Connectors on controls for heating and air conditioning system
  188
• 8 Other controlling and regulating components
  192
• 8.2 Principle of operation of air quality sensor G238
  193
• 8.3 Removing and installing air quality sensor G238
  194
• 8.4 Removing and installing ambient temperature sensor G17
  195
• 8.5 Removing and installing left vent temperature sender G150
  196
• 8.6 Removing and installing right vent temperature sender G151
  196
• 8.7 Removing and installing footwell vent temperature sender G192
  197
• 8.8 Removing and installing left footwell vent temperature sender G261
  197
• 8.9 Removing and installing right footwell vent temperature sender G262
  197