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
  1
• 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 heater
  3
• 2 General information
  4
• 2.1 Type plates
  4
• 2.2 Notes concerning odours in air conditioned vehicles
  4
• 2.3 Notes for vehicles with start-stop system
  5
• 2.4 Notes on dust and pollen filter
  6
• 3 Repair instructions
  8
• 3.1 Rules for cleanliness
  8
• 3.2 Nuts and bolts
  8
• 3.3 Routing and attachment of lines
  8
• 3.4 Fitting radiator and condensers
  9
• 3.5 Checking heater output
  9
• 3.6 Checking cooling output
  11
• 3.7 Working on refrigerant circuit
  14
• 3.8 Paint work on vehicles with air conditioning system
  14
• 3.9 Refrigerant circuit seals
  15
• 3.10 General repair instructions
  15
• 4 Technical data
  16
• 4.1 Refrigerant capacity
  16
• 4.2 Refrigerant oil capacities
  16
• 4.3 Oil distribution
  17
• Heating
  18
• 1 Overview of fitting locations - heating
  18
• 1.1 Overview of fitting locations - components not located in passenger compartment
  18
• 2 Heater
  21
• 2.1 Assembly overview – heater unit
  21
• 3 Control motors
  26
• 3.1 Overview of fitting locations – front control motors
  26
• 4 Air duct
  27
• 5 Operating and display unit
  28
• 5.1 Overview of operating and display unit
  28
• 6 Other controlling and regulating components
  30
• Air conditioning system
  31
• 1 Overview of fitting locations - air conditioning system
  31
• 1.1 Overview of fitting locations - components not located in passenger compartment
  31
• 2 Refrigerant circuit
  36
• 2.1 System overview - refrigerant circuit
  36
• 2.2 Assembly overview - condenser
  39
• 2.3 Removing and installing refrigerant circuit pressure sender G805
  40
• 2.4 Removing and installing refrigerant line with internal heat exchanger
  41
• 2.5 Removing and installing expansion valve
  44
• 2.6 Removing and installing condenser
  48
• 2.7 Removing and installing desiccant bag or cartridge
  51
• 2.8 Removing and installing damper weight for refrigerant line, low-pressure side
  55
• 2.9 Removing and installing evacuating and charging valves on low and high-pressure side
  56
• 3 Air conditioner compressor
  66
• 3.1 Assembly overview - drive unit of air conditioner compressor
  66
• 3.2 Assembly overview - pulley
  67
• 3.3 Removing air conditioning compressor from and installing on bracket
  69
• 3.4 Removing and installing air conditioner compressor
  70
• 3.5 Checking high-pressure safety valve on air conditioner compressor
  75
• 3.6 Removing and installing pulley
  76
• 4 Control motors
  79
• 4.1 Overview of fitting locations – front control motors
  79
• 4.2 Removing and installing temperature flap control motor V68
  81
• 4.3 Removing and installing defroster flap control motor V107
  83
• 4.4 Removing and installing air recirculation flap control motor V113
  85
• 4.5 Removing and installing left temperature flap control motor V158
  86
• 4.6 Removing and installing right temperature flap control motor V159
  88
• 4.7 Removing and installing fresh air/air recirculation, air flow flap control motor V425
  90
• 4.8 Removing and installing front air distribution flap control motor V426
  91
• 4.9 Removing and installing air distribution flap control motor V428
  93
• 4.10 Removing and installing air distribution flap actuator
  96
• 5 Front heater and air conditioning unit
  99
• 5.1 Assembly overview - add-on parts of heater and air conditioning unit and of air intake box
  99
• 5.2 Assembly overview - flaps and partitions in air distribution housing
  101
• 5.3 Assembly overview – heater and air conditioning unit
  103
• 5.4 Assembly overview – evaporator housing
  107
• 5.5 Removing and installing evaporator
  108
• 5.6 Checking auxiliary air heater element Z35
  109
• 5.7 Removing and installing auxiliary air heater element Z35
  110
• 5.8 Removing and installing heater and air conditioning unit
  112
• 5.9 Removing and installing holder for heater and air conditioning unit
  117
• 5.10 Dismantling and assembling heater and air conditioning unit
  119
• 5.11 Removing and installing air distribution housing
  120
• 5.12 Removing and installing dust and pollen filter
  120
• 5.13 Removing and installing fresh air blower V2
  123
• 5.14 Removing and installing fresh air blower control unit J126
  123
• 5.15 Removing and installing heat exchanger
  124
• 5.16 Removing and installing coolant pipes on heat exchanger
  128
• 5.17 Removing and installing evaporator temperature sensor G308
  130
• 5.18 Removing and installing condensation drain
  131
• 5.19 Checking condensation drain
  132
• 6 Air duct
  134
• 6.1 Assembly overview - air duct and air distribution in passenger compartment
  134
• 6.2 Removing and installing driver side footwell vents
  135
• 6.3 Removing and installing front passenger side footwell vents
  136
• 6.4 Removing and installing rear footwell vent
  137
• 6.5 Removing and installing air ducts
  138
• 6.6 Removing and installing forced ventilation for passenger compartment
  139
• 6.7 Checking forced ventilation for passenger compartment
  141
• 6.8 Removing and installing fresh air intake
  141
• 6.9 Removing and installing cover for fresh air intake
  142
• 6.10 Removing and installing air intake duct
  142
• 6.11 Removing and installing air duct for defroster vent
  143
• 6.12 Removing and installing air duct for centre dash panel vent
  144
• 7 Operating and display unit
  145
• 7.1 Overview of fitting locations – operating and display unit
  145
• 7.2 Removing and installing operating and display unit
  149
• 8 Other controlling and regulating components
  151
• 8.1 Removing and installing sunlight penetration photosensor G107
  151
• 8.2 Principle of operation of air quality sensor G238
  151
• 8.3 Removing and installing air quality sensor G238
  153
• 8.4 Removing and installing ambient temperature sensor G17
  154
• 8.5 Removing and installing humidity sender for air conditioning system G260
  154
• 8.6 Removing and installing left vent temperature sender G150
  154
• 8.7 Removing and installing right vent temperature sender G151
  155
• 8.8 Removing and installing footwell vent temperature sender G192
  156