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 start/stop system
  2
• 1.4 Safety precautions when working on a high-voltage system
  2
• 1.5 Safety precautions when working in the vicinity of high-voltage components
  3
• 1.6 Safety precautions when working on the cooling system
  3
• 1.7 Safety precautions when handling refrigerants
  4
• 1.8 Safety precautions for working on vehicles with auxiliary/supplementary heater
  4
• 1.9 Safety precautions when working on SCR system
  5
• 2 General information
  7
• 2.1 Type plates
  7
• 2.2 Notes concerning odours in air conditioned vehicles
  8
• 3 Repair instructions
  10
• 3.1 Rules for cleanliness
  10
• 3.2 General information
  10
• 3.3 General repair instructions
  11
• 3.4 Contact corrosion
  11
• 3.5 Bolts and nuts
  11
• 3.6 Pipe/wire routing and attachment
  11
• 3.7 Fitting radiator and condensers
  12
• 3.8 Checking cooling output
  12
• 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
  17
• 4.3 Oil distribution
  18
• 5 Hazard classification for the high-voltage system
  19
• Heating
  20
• 1 Heater
  20
• 1.1 Overview of fitting locations - heater unit
  20
• 1.2 Assembly overview – heater unit
  21
• 1.3 Removing and installing fresh air blower V2
  23
• 1.4 Removing and installing fresh air blower series resistor with overheating fuse N24
  23
• 1.5 Removing and installing dust and pollen filter
  24
• 1.6 Removing and installing heat exchanger
  25
• 1.7 Removing and installing coolant pipes on heat exchanger
  26
• 1.8 Removing and installing heater unit
  28
• 1.9 Checking ventilation
  30
• 1.10 Removing and installing air intake unit of heater
  31
• 2 Control motors
  34
• 2.1 Removing and installing air recirculation flap control motor V113
  34
• 3 Air duct
  35
• 3.1 Assembly overview – air duct and air distribution in passenger compartment
  35
• 3.2 Removing and installing driver side footwell vents
  36
• 4 Operating and display unit
  38
• 4.1 Removing and installing operating and display unit
  38
• Ventilation
  42
• 1 Roof ventilator V3, normal roof
  42
• 1.1 Assembly overview - roof ventilator
  42
• 1.2 Removing and installing roof ventilator V3
  43
• 1.3 Removing and installing air duct rosette
  44
• 1.4 Removing and installing roof ventilator V3 frame
  45
• 2 Roof ventilator V3, high roof and middle height roof
  47
• 2.1 Assembly overview - roof ventilator
  47
• 2.2 Removing and installing roof ventilator V3
  47
• 2.3 Removing and installing air duct rosette
  50
• 2.4 Removing and installing roof ventilator V3 frame
  51
• Air conditioning system
  52
• 1 Overview of fitting locations - air conditioning system
  52
• 1.1 Overview of fitting locations - components not located in passenger compartment
  52
• 2 Refrigerant circuit
  61
• 2.1 System overview - refrigerant circuit
  61
• 2.2 Removing and installing high-pressure sender G65
  63
• 2.3 Removing and installing expansion valve
  65
• 2.4 Removing and installing condenser
  71
• 2.5 Removing and installing desiccant bag or cartridge
  74
• 2.7 Commissioning air conditioning system after filling refrigerant circuit
  79
• 2.8 When is it necessary to purge the refrigerant circuit with refrigerant
  80
• 3 Air conditioner compressor
  82
• 3.1 Assembly overview – drive unit of air conditioner compressor
  82
• 3.2 Assembly overview - pulley
  83
• 3.3 Removing and installing air conditioner compressor
  84
• 3.4 Checking high-pressure safety valve on air conditioner compressor
  89
• 3.5 Removing and installing pulley
  90
• 3.6 Removing and installing air conditioner compressor regulating valve N280
  92
• 4 Control motors
  96
• 4.1 Overview of fitting locations – control motors at front
  96
• 4.2 Removing and installing temperature flap control motor V68
  99
• 4.3 Removing and installing defroster flap control motor V107
  101
• 4.4 Removing and installing air recirculation flap control motor V113
  103
• 4.5 Removing and installing left temperature flap control motor V158
  105
• 4.6 Removing and installing right temperature flap control motor V159
  106
• 4.7 Removing and installing air distribution flap control motor V428
  107
• 4.8 Removing and installing fresh air/air recirculation, air flow flap control motor V425
  111
• 4.9 Removing and installing footwell flap control motor V261
  113
• 4.10 Removing and installing air distribution flap actuator
  116
• 5 Front heater and air conditioning unit
  120
• 5.1 Assembly overview – heater and air conditioning unit
  120
• 5.2 Removing and installing heater and air conditioning unit
  124
• 5.3 Removing and installing dust and pollen filter
  129
• 5.4 Removing and installing fresh air blower V2
  130
• 5.5 Removing and installing fresh air blower control unit J126
  136
• 5.6 Removing and installing heat exchanger
  137
• 5.7 Removing and installing coolant pipes on heat exchanger
  138
• 5.8 Removing and installing evaporator temperature sensor G308
  140
• 5.9 Checking condensation drain
  141
• 5.10 Removing and installing fresh air blower series resistor with overheating fuse N24
  142
• 5.11 Removing and installing air distribution housing
  143
• 6 Rear heater and air conditioning unit
  146
• 6.1 Assembly overview – heater and air conditioning unit
  146
• 6.2 Removing and installing evaporator
  148
• 6.3 Removing and installing heater and air conditioning unit
  148
• 6.4 Removing and installing rear fresh air blower V80
  153
• 6.5 Removing and installing rear blower regulation sender G463
  153
• 6.6 Removing and installing heat exchanger
  153
• 6.7 Removing and installing control motors
  155
• 7 Operating and display unit
  160
• 7.1 Overview of operating and display unit
  160
• 7.2 Removing and installing operating and display unit
  165
• 8 Other controlling and regulating components
  169
• 8.1 Removing and installing sunlight penetration photosensor G107
  169
• 8.2 Working principles of air quality sensor G238
  170
• 8.3 Removing and installing air quality sensor G238
  171
• 8.4 Removing and installing ambient temperature sensor G17
  172
• 8.5 Removing and installing humidity sender for air conditioning system G260
  173
• 8.6 Removing and installing left vent temperature sender G150
  173
• 8.7 Removing and installing right vent temperature sender G151
  174
• 8.8 Removing and installing left footwell vent temperature sender G261
  174
• 8.9 Removing and installing right footwell vent temperature sender G262
  175