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/supplementary heater
  3
• 2 Identification
  5
• 2.1 Identification of heater and air conditioning unit
  5
• 3 General information
  6
• 3.1 Type plates
  6
• 3.2 Notes concerning odours in air conditioned vehicles
  6
• 4 Repair notes
  8
• 4.1 Rules for cleanliness
  8
• 4.2 General repair instructions
  8
• 4.3 Contact corrosion
  9
• 4.4 Nuts and bolts
  9
• 4.5 Routing and attachment of lines
  9
• 4.6 Checking cooling output
  10
• 4.7 Working on refrigerant circuit
  11
• 4.8 Refrigerant circuit seals
  12
• 5 Technical data
  13
• 5.1 Refrigerant capacity
  13
• 5.2 Refrigerant oil capacities
  13
• 5.3 Oil distribution
  13
• Heating
  15
• 1 Heater
  15
• 1.1 Assembly overview – heater unit
  15
• 1.2 Removing and installing flow rate limiter
  19
• Ventilation
  21
• 1 Roof blower
  21
• 1.1 Assembly overview - roof blower
  21
• 1.2 Removing and installing roof blower
  21
• 1.3 Removing and installing roof ventilator V3
  22
• 1.4 Removing and installing rear fresh air blower control unit J391
  24
• 1.5 Dismantling and assembling roof blower
  25
• 2 Roof blower air duct
  27
• 2.1 Overview of fitting locations - air ducts and air distribution
  27
• 2.2 Removing and installing ventilation grille
  27
• 2.3 Removing and installing air duct
  28
• 2.4 Removing and installing vents
  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
  37
• 2.1 System overview - refrigerant circuit
  37
• 2.2 Assembly overview - refrigerant lines
  38
• 2.3 Removing and installing refrigerant circuit pressure sender G805
  40
• 2.4 Removing and installing refrigerant line with internal heat exchanger
  42
• 2.5 Removing and installing expansion valve
  45
• 2.6 Removing and installing condenser
  48
• 2.7 Separating and connecting refrigerant lines on condenser
  50
• 2.8 Removing and installing desiccant bag or cartridge
  52
• 2.10 Commissioning air conditioning system after filling refrigerant circuit
  55
• 2.14 When is it necessary to purge the refrigerant circuit with refrigerant
  66
• 3 Air conditioner compressor
  68
• 3.1 Assembly overview - air conditioner compressor
  68
• 3.2 Removing air conditioning compressor from and installing on bracket
  72
• 3.3 Removing refrigerant lines from and installing to air conditioner compressor
  74
• 3.4 Removing and installing air conditioner compressor
  76
• 3.5 Checking high-pressure safety valve on air conditioner compressor
  79
• 3.6 Removing and installing air conditioner compressor regulating valve N280
  80
• 4 Control motors
  84
• 4.1 Overview of fitting locations – front control motors
  84
• 4.2 Assembly overview - front control motors
  89
• 4.3 Assembly overview - flap control
  92
• 4.4 Removing and installing temperature flap VX27
  93
• 4.5 Removing and installing air recirculation flap VX52
  95
• 4.6 Removing and installing front left temperature flap VX34
  97
• 4.7 Removing and installing front right temperature flap VX35
  98
• 4.8 Removing and installing defroster flap VX47
  100
• 4.9 Removing and installing air distribution flap VX33
  102
• 4.10 Removing and installing air distribution flap adjustment unit
  104
• 4.11 Removing and installing fresh air and air recirculation flap VX96
  106
• 5 Front heater and air conditioning unit
  108
• 5.1 Assembly overview – heater and air conditioning unit
  108
• 5.2 Assembly overview – evaporator housing
  113
• 5.3 Removing and installing evaporator
  115
• 5.4 Checking auxiliary air heater element Z35
  115
• 5.5 Removing and installing auxiliary air heater element Z35
  116
• 5.6 Removing and installing heater and air conditioning unit
  118
• 5.7 Removing and installing holder for heater and air conditioning unit
  124
• 5.8 Dismantling and assembling heater and air conditioning unit
  127
• 5.9 Removing and installing air distribution housing
  128
• 5.10 Removing and installing dust and pollen filter
  130
• 5.11 Removing and installing fresh air blower V2
  132
• 5.12 Removing and installing fresh air blower control unit J126
  133
• 5.13 Removing and installing heat exchanger
  134
• 5.14 Removing and installing coolant pipes on heat exchanger
  136
• 5.15 Removing and installing evaporator temperature sensor G308
  140
• 5.16 Removing and installing condensation drain
  141
• 5.17 Checking condensation drain
  143
• 6 Air duct
  144
• 6.2 Removing and installing driver side footwell vents
  148
• 6.3 Removing and installing front passenger side footwell vents
  148
• 6.4 Removing and installing rear footwell vent
  150
• 6.5 Removing and installing air ducts
  152
• 6.6 Removing and installing forced ventilation for passenger compartment
  155
• 6.7 Checking forced ventilation for passenger compartment
  158
• 6.8 Removing and installing fresh air intake
  159
• 6.9 Removing and installing cover for fresh air intake
  161
• 6.10 Removing and installing air intake duct
  162
• 6.11 Removing and installing air duct for defroster vent
  162
• 6.12 Removing and installing air duct for centre dash panel vent
  163
• 7 Operating and display unit
  164
• 7.1 Overview of operating and display unit
  164
• 7.2 Removing and installing operating and display unit
  164
• 8 Other controlling and regulating components
  165
• 8.1 Removing and installing sunlight penetration photosensor G107
  165
• 8.2 Removing and installing ambient temperature sensor G17
  166
• 8.3 Removing and installing humidity sender for air conditioning system G260
  166
• 8.4 Removing and installing left vent temperature sender G150
  166
• 8.5 Removing and installing right vent temperature sender G151
  167
• 8.6 Removing and installing footwell vent temperature sender G192
  167
• 8.7 Removing and installing vehicle interior temperature sensor G1090
  169
• 8.8 Removing and installing heater and air conditioning system control unit J979
  170