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 when working on vehicles with a start/stop system
  2
• 1.4 Safety precautions when working on the cooling system
  2
• 1.5 Safety precautions when handling refrigerants
  2
• 1.6 Safety precautions for working on vehicles with auxiliary/supplementary heater
  3
• 1.7 Safety precautions when working on the SCR system
  4
• 2 General information
  6
• 2.1 Type plates
  6
• 2.2 Notes concerning odours in air conditioned vehicles
  7
• 3 Repair instructions
  9
• 3.1 Rules for cleanliness
  9
• 3.2 General information
  9
• 3.3 General repair instructions
  10
• 3.4 Contact corrosion
  10
• 3.5 Bolts and nuts
  10
• 3.6 Routing and attachment of lines
  10
• 3.7 Fitting radiators and condensers
  11
• 3.8 Checking cooling output
  11
• 3.9 Working on refrigerant circuit
  13
• 3.10 Refrigerant circuit seals
  14
• 4 Technical data
  16
• 4.1 Refrigerant capacity
  16
• 4.2 Refrigerant oil capacities
  16
• 4.3 Oil distribution
  17
• 5 Hazard classification for the high-voltage system
  18
• Heating
  19
• 1 Overview of fitting locations - heating
  19
• 2 Heater
  22
• 2.1 Assembly overview – heater unit
  22
• 2.2 Removing and installing heat exchanger
  24
• 2.3 Removing and installing flexible shafts
  30
• 3 Control motors
  32
• 3.1 Overview of fitting locations – control motors at front
  32
• 4 Air duct
  33
• 5 Operating and display unit
  34
• 5.1 Removing and installing operating and display unit
  34
• 6 Other controlling and regulating components
  36
• Air conditioning system
  37
• 1 Overview of fitting locations - air conditioning system
  37
• 1.1 Overview of fitting locations - components not located in passenger compartment
  37
• 2 Refrigerant circuit
  43
• 2.1 System overview - refrigerant circuit
  43
• 2.2 Assembly overview – condenser
  44
• 2.3 Removing and installing high-pressure sender G65
  45
• 2.4 Disconnecting refrigerant lines from and connecting to service connections
  50
• 2.5 Removing and installing expansion valve
  51
• 2.6 Removing and installing condenser
  55
• 2.7 Removing and installing desiccant bag or cartridge
  58
• 2.9 Commissioning air conditioning system after filling refrigerant circuit
  66
• 2.10 When is it necessary to purge the refrigerant circuit with refrigerant
  67
• 3 Air conditioner compressor
  69
• 3.1 Assembly overview – air conditioner compressor
  69
• 3.2 Removing and installing air conditioner compressor
  72
• 3.3 Checking high-pressure safety valve on air conditioner compressor
  76
• 3.4 Removing and installing air conditioner compressor regulating valve N280
  78
• 4 Control motors
  82
• 4.1 Overview of fitting locations – control motors at front
  82
• 4.2 Removing and installing temperature flap control motor V68
  84
• 4.3 Removing and installing defroster flap control motor V107
  86
• 4.4 Removing and installing air recirculation flap control motor V113
  88
• 4.5 Removing and installing left temperature flap control motor V158
  90
• 4.6 Removing and installing right temperature flap control motor V159
  92
• 4.7 Removing and installing fresh air/air recirculation, air flow flap control motor V425
  93
• 4.8 Removing and installing front air distribution flap control motor V426
  93
• 4.9 Removing and installing air distribution flap control motor V428
  94
• 5 Front heater and air conditioning unit
  96
• 5.1 Assembly overview – heater and air conditioning unit
  96
• 5.2 Assembly overview – evaporator housing
  100
• 5.3 Removing and installing evaporator
  101
• 5.4 Checking auxiliary air heater element Z35
  103
• 5.5 Removing and installing auxiliary air heater element Z35
  103
• 5.6 Removing and installing heater and air conditioning unit
  105
• 5.7 Dismantling and assembling heater and air conditioning unit
  110
• 5.8 Removing and installing air distribution housing
  111
• 5.9 Removing and installing dust and pollen filter
  112
• 5.10 Removing and installing fresh air blower V2
  114
• 5.11 Removing and installing fresh air blower control unit J126
  114
• 5.12 Removing and installing heat exchanger
  115
• 5.13 Removing and installing coolant pipes on heat exchanger
  115
• 5.14 Removing and installing evaporator temperature sensor G308
  117
• 5.15 Removing and installing condensation drain
  117
• 5.16 Checking condensation drain
  118
• 5.17 Removing and installing fresh air blower series resistor with overheating fuse N24
  119
• 6 Air duct
  120
• 6.1 Assembly overview – air duct and air distribution in passenger compartment
  120
• 6.2 Removing and installing driver side footwell vents
  121
• 6.3 Removing and installing front passenger side footwell vents
  123
• 6.4 Removing and installing rear footwell vent
  123
• 6.5 Installing plug in air duct to centre vent
  124
• 6.6 Removing and installing air ducts
  125
• 6.7 Checking forced ventilation for passenger compartment
  126
• 6.8 Removing and installing fresh air intake
  126
• 6.9 Removing and installing air intake duct
  128
• 6.10 Removing and installing air duct for defroster vent
  129
• 6.11 Removing and installing air duct for centre dash panel vent
  130
• 7 Operating and display unit
  131
• 7.1 Overview of operating and display unit
  131
• 7.2 Removing and installing operating and display unit
  132
• 8 Other controlling and regulating components
  133
• 8.1 Removing and installing sunlight penetration photosensor G107
  133
• 8.2 Working principles of air quality sensor G238
  134
• 8.3 Removing and installing air quality sensor G238
  135
• 8.4 Removing and installing ambient temperature sensor G17
  137
• 8.5 Removing and installing humidity sender for air conditioning system G260
  137
• 8.6 Removing and installing left vent temperature sender G150
  137
• 8.7 Removing and installing right vent temperature sender G151
  138
• 8.8 Removing and installing centre vent temperature sender G191
  139
• 8.9 Removing and installing footwell vent temperature sender G192
  139
• 8.10 Removing and installing left footwell vent temperature sender G261
  140
• 8.11 Removing and installing right footwell vent temperature sender G262
  140