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 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 SCR system
  4
• 2 General information
  6
• 2.1 Type plates
  6
• 2.2 Notes concerning odours in air conditioned vehicles
  7
• 3 Repair notes
  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 Nuts and bolts
  10
• 3.6 Pipe/wire routing and attachment
  10
• 3.7 Fitting radiator and condensers
  11
• 3.8 Checking cooling output
  11
• 3.9 Working on refrigerant circuit
  12
• 3.10 Refrigerant circuit seals
  14
• 4 Technical data
  15
• 4.1 Refrigerant capacity
  15
• 4.2 Refrigerant oil capacities
  16
• 4.3 Oil distribution
  16
• 5 Hazard classification of high-voltage system
  18
• Heating
  19
• 1 Heater
  19
• 1.1 Overview of fitting locations - heater unit
  19
• 1.2 Assembly overview – heater unit
  20
• 1.3 Removing and installing fresh air blower V2
  22
• 1.4 Removing and installing fresh air blower series resistor with overheating fuse N24
  22
• 1.5 Removing and installing dust and pollen filter
  23
• 1.6 Removing and installing heat exchanger
  24
• 1.7 Removing and installing coolant pipes on heat exchanger
  24
• 1.8 Removing and installing heater unit
  26
• 1.9 Checking ventilation
  29
• 1.10 Removing and installing air distribution housing
  30
• 2 Control motors
  33
• 2.1 Removing and installing air recirculation flap control motor V113
  33
• 3 Air duct
  34
• 3.1 Assembly overview – air duct and air distribution in passenger compartment
  34
• 3.2 Removing and installing driver side footwell vents
  35
• 4 Operating and display unit
  37
• 4.1 Removing and installing operating and display unit
  37
• Ventilation
  39
• 1 Roof ventilator V3, normal roof
  39
• 1.1 Assembly overview - roof ventilator
  39
• 1.2 Removing and installing roof ventilator V3
  40
• 1.3 Removing and installing air duct rosette
  41
• 1.4 Removing and installing roof ventilator V3 frame
  42
• 2 Roof ventilator V3, high roof and middle height roof
  44
• 2.1 Assembly overview - roof ventilator
  44
• 2.2 Removing and installing roof ventilator V3
  44
• 2.3 Removing and installing air duct rosette
  47
• 2.4 Removing and installing roof ventilator V3 frame
  48
• Air conditioning system
  49
• 1 Overview of fitting locations - air conditioning system
  49
• 1.1 Overview of fitting locations - components not located in passenger compartment
  49
• 2 Refrigerant circuit
  54
• 2.1 System overview - refrigerant circuit
  54
• 2.2 Removing and installing refrigerant circuit pressure sender G805
  56
• 2.3 Removing and installing expansion valve
  58
• 2.4 Removing and installing condenser
  63
• 2.5 Removing and installing desiccant bag or cartridge
  66
• 2.7 Commissioning air conditioning system after filling refrigerant circuit
  70
• 2.8 When is it necessary to purge the refrigerant circuit with refrigerant
  71
• 3 Air conditioner compressor
  73
• 3.1 Assembly overview – drive unit of air conditioner compressor
  73
• 3.2 Assembly overview - pulley
  76
• 3.3 Removing and installing air conditioner compressor
  79
• 3.4 Removing air conditioning compressor from and installing on bracket
  83
• 3.5 Checking high-pressure safety valve on air conditioner compressor
  85
• 3.6 Removing and installing pulley
  86
• 3.7 Removing and installing air conditioner compressor regulating valve N280
  90
• 4 Control motors
  94
• 4.1 Overview of fitting locations – control motors at front
  94
• 4.2 Removing and installing temperature flap control motor V68
  97
• 4.3 Removing and installing defroster flap control motor V107
  99
• 4.4 Removing and installing air recirculation flap control motor V113
  101
• 4.5 Removing and installing left temperature flap control motor V158
  103
• 4.6 Removing and installing right temperature flap control motor V159
  104
• 4.7 Removing and installing air distribution flap control motor V428
  106
• 4.8 Removing and installing fresh air/air recirculation, air flow flap control motor V425
  110
• 4.9 Removing and installing footwell flap control motor V261
  112
• 4.10 Removing and installing air distribution flap adjustment unit
  114
• 5 Front heater and air conditioning unit
  118
• 5.1 Assembly overview – heater and air conditioning unit
  118
• 5.2 Removing and installing heater and air conditioning unit
  122
• 5.3 Removing and installing dust and pollen filter
  127
• 5.4 Removing and installing fresh air blower V2
  128
• 5.5 Removing and installing fresh air blower control unit J126
  134
• 5.6 Removing and installing heat exchanger
  135
• 5.7 Removing and installing coolant pipes on heat exchanger
  136
• 5.8 Removing and installing evaporator temperature sensor G308
  138
• 5.9 Checking condensation drain
  139
• 5.11 Removing and installing air distribution housing
  140
• 6 Rear heater and air conditioning unit
  143
• 6.1 Assembly overview – heater and air conditioning unit
  143
• 6.2 Removing and installing evaporator
  145
• 6.3 Removing and installing heater and air conditioning unit
  145
• 6.4 Removing and installing rear fresh air blower V80
  149
• 6.5 Removing and installing rear fresh air blower control unit J391
  150
• 6.6 Removing and installing heat exchanger
  151
• 6.7 Removing and installing control motors
  153
• 7 Operating and display unit
  157
• 7.1 Overview of operating and display unit
  157
• 7.2 Removing and installing operating and display unit
  163
• 8 Other controlling and regulating components
  167
• 8.1 Removing and installing sunlight penetration photosensor G107
  167
• 8.2 Working principles of air quality sensor G238
  168
• 8.3 Removing and installing air quality sensor G238
  169
• 8.4 Removing and installing ambient temperature sensor G17
  170
• 8.5 Removing and installing humidity sender for air conditioning system G260
  171
• 8.6 Removing and installing left vent temperature sender G150
  171
• 8.7 Removing and installing right vent temperature sender G151
  172
• 8.8 Removing and installing left footwell vent temperature sender G261
  172
• 8.9 Removing and installing right footwell vent temperature sender G262
  173