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 precautions when handling refrigerants
  1
• 1.3 Safety measures when working on vehicles with a start/stop system
  2
• 1.4 Safety precautions when working on the cooling system
  2
• 2 General information
  3
• 2.1 Notes concerning odours in air conditioned vehicles
  3
• 2.2 Notes for vehicles with start-stop system
  3
• 2.3 Type plates
  4
• 3 Repair instructions
  5
• 3.1 Working on refrigerant circuit
  5
• 3.2 General repair instructions
  5
• 3.3 Refrigerant circuit seals
  5
• 3.4 Checking cooling output
  6
• 3.5 Notes on control motors
  7
• 4 Technical data
  13
• 4.1 Refrigerant capacity
  13
• 4.2 Refrigerant oil capacities
  13
• 4.3 Oil distribution
  14
• Heating
  16
• 1 Heating
  16
• Air conditioning system
  17
• 1 Overview of fitting locations - air conditioning system
  17
• 1.1 Overview of fitting locations - components not located in passenger compartment
  17
• 2 Refrigerant circuit
  25
• 2.1 System overview - refrigerant circuit
  25
• 2.2 Assembly overview - condenser
  27
• 2.3 Removing and installing high-pressure sender G65
  28
• 2.4 Removing and installing expansion valve
  30
• 2.5 Removing and installing condenser
  34
• 2.6 Removing and installing desiccant bag or cartridge
  36
• 2.7 Removing and installing evacuating and charging valves on low and high-pressure side
  40
• 2.13 Removing and installing refrigerant line from second heater unit
  54
• 3 Air conditioner compressor
  58
• 3.1 Assembly overview - drive unit of air conditioner compressor
  58
• 3.2 Assembly overview - pulley
  61
• 3.3 Removing air conditioning compressor from and installing on bracket
  62
• 3.4 Removing and installing air conditioner compressor
  63
• 3.5 Checking high-pressure safety valve on air conditioner compressor
  69
• 3.6 Removing and installing pulley
  70
• 4 Control motors
  72
• 4.1 Overview of fitting locations - front control motors
  72
• 4.2 Removing and installing temperature flap control motor V68
  74
• 4.3 Removing and installing defroster flap control motor V107
  76
• 4.4 Removing and installing air recirculation flap control motor V113
  78
• 4.5 Removing and installing rear temperature flap control motor V137
  79
• 4.6 Removing and installing left temperature flap control motor V158
  80
• 4.7 Removing and installing right temperature flap control motor V159
  82
• 4.8 Removing and installing fresh air/air recirculation, air flow flap control motor V425
  83
• 4.9 Removing and installing front air distribution flap control motor V426
  84
• 4.11 Removing and installing air distribution flap control motor V428
  86
• 5 Front heater and air conditioning unit
  87
• 5.1 Assembly overview - heater and air conditioning unit
  87
• 5.2 Removing and installing auxiliary air heater element Z35
  91
• 5.3 Removing and installing heater and air conditioning unit
  92
• 5.4 Dismantling and assembling heater and air conditioning unit
  97
• 5.5 Assembly overview - evaporator housing
  99
• 5.6 Removing and installing evaporator
  100
• 5.7 Removing and installing dust and pollen filter
  101
• 5.8 Removing and installing fresh air blower V2
  102
• 5.9 Removing and installing heat exchanger
  103
• 5.10 Removing and installing evaporator temperature sensor G308
  107
• 5.11 Removing and installing condensation drain
  108
• 5.12 Checking condensation drain
  108
• 5.13 Removing and installing fresh air blower series resistor with overheating fuse N24
  109
• 5.14 Removing and installing glove box cooling
  110
• 6 Rear heater and air conditioning unit
  111
• 6.1 Assembly overview - heater and air conditioning unit
  111
• 6.2 Removing and installing heater and air conditioning unit
  114
• 6.3 Dismantling and assembling heater and air conditioning unit
  118
• 6.4 Removing and installing rear fresh air blower V80
  120
• 6.5 Removing and installing rear fresh air blower control unit J391
  120
• 6.6 Removing and installing heat exchanger
  122
• 7 Air duct
  125
• 7.1 Assembly overview - air duct and air distribution in passenger compartment
  125
• 7.2 Removing and installing air ducts
  126
• 7.3 Removing and installing forced ventilation for passenger compartment
  131
• 7.4 Checking forced ventilation for passenger compartment
  132
• 7.5 Removing and installing fresh air intake
  132
• 7.6 Removing and installing driver side footwell vents
  133
• 7.7 Removing and installing front passenger side footwell vents
  134
• 7.8 Removing and installing long rear vent
  135
• 7.9 Removing and installing short rear vent
  135
• 7.10 Removing and installing footwell vents for 3rd row of seats
  136
• 8 Coolant circuit
  138
• 8.1 Checking 2nd heat exchanger switch-off valve N317
  138
• 8.2 Removing and installing 2nd heat exchanger switch-off valve N317
  139
• 9 Operating and display unit
  140
• 9.1 Overview of operating and display unit
  140
• 9.2 Removing and installing operating and display unit
  145
• 10 Other controlling and regulating components
  148
• 10.1 Removing and installing sunlight penetration photosensor G107
  148
• 10.2 Principle of operation of air quality sensor G238
  149
• 10.3 Removing and installing air quality sensor G238
  150
• 10.4 Removing and installing ambient temperature sensor G17
  151
• 10.5 Removing and installing left vent temperature sender G150
  151
• 10.6 Removing and installing right vent temperature sender G151
  152
• 10.7 Removing and installing left footwell vent temperature sender G261
  152
• 10.8 Removing and installing right footwell vent temperature sender G262
  153
• 10.9 Removing and installing rear vent temperature sender G174
  153