Heating, air conditioner

Chapter overview

• Technical data
  1
• 1 General notes
  1
• 1.1 Notes concerning odours in air conditioned vehicles
  1
• 1.2 Notes for vehicles with a start-stop system
  1
• 1.3 Notes on repair work to vehicles with air conditioning and on handling refrigerant
  2
• 1.4 Procedure for checking and adjusting components
  2
• 1.5 Identification plates
  2
• 2 Notes on safety
  4
• 2.1 Safety precautions when handling refrigerants
  4
• 2.2 Safety measures for when working on vehicles with a start-stop system
  5
• 3 Repair notes
  6
• 4 Technical data
  8
• 4.1 Capacities for refrigerant R134a
  8
• 4.2 Refrigerant machine oil
  8
• 4.3 Oil distribution
  9
• Heating
  10
• 1 Overview of fitting locations - heating
  10
• 1.1 Overview of fitting locations - components not located in passenger compartment
  10
• 2 Heater unit
  15
• 2.1 Assembly overview – heater unit
  15
• 2.2 Removing and installing fresh air blower V2
  17
• 2.3 Removing and installing fresh air blower series resistor with overheating fuse N24
  17
• 2.4 Removing and installing dust and pollen filter
  17
• 2.5 Removing and installing heat exchanger
  17
• 2.6 Removing and installing heater unit
  17
• 2.7 Dismantling and assembling heater unit
  17
• 2.8 Checking auxiliary air heater element Z35
  19
• 2.9 Removing and installing auxiliary air heater element Z35
  19
• 2.10 Removing and installing flexible shafts
  19
• 3 Control motors
  20
• 3.1 Overview of fitting locations - front control motors
  20
• 3.2 Removing and installing air distribution flap actuator
  21
• 3.3 Removing and installing temperature flap actuator
  23
• 3.4 Removing and installing fresh air and air recirculation flap control motor V154
  26
• 4 Air duct
  27
• 4.1 Assembly overview - air duct and air distribution in passenger compartment
  27
• 4.2 Removing and installing centre vent at front
  27
• 4.3 Removing and installing right or left vent
  27
• 4.4 Removing and installing driver side footwell vents
  27
• 4.5 Removing and installing front passenger side footwell vents
  27
• 4.6 Removing and installing rear air duct
  27
• 4.7 Checking exhaust ventilation for passenger compartment
  27
• 4.8 Removing and installing exhaust ventilation for passenger compartment
  28
• 4.9 Removing and installing fresh air intake
  28
• 4.10 Removing and installing air duct for defroster vent
  28
• 4.11 Removing and installing air duct for centre vent
  28
• 5 Operating and display unit
  29
• 5.1 Exploded view of fitting locations - operating and display unit
  29
• 5.2 Removing and installing operating and display unit
  30
• 6 Other controlling and regulating components
  32
• 6.1 Removing and installing ambient temperature sensor G17
  32
• Air conditioning system
  33
• 1 Overview of fitting locations - air conditioning system
  33
• 1.1 Overview of fitting locations - components not located in passenger compartment
  33
• 2 Refrigerant circuit
  47
• 2.1 System overview - refrigerant circuit
  47
• 2.2 Assembly overview - condenser
  49
• 2.4 Removing and installing high-pressure sender G65
  53
• 2.5 Removing and installing condenser
  55
• 2.6 Removing and installing desiccant bag or cartridge
  56
• 2.7 Removing and installing expansion valve
  59
• 3 Air conditioner compressor
  62
• 3.1 Assembly overview - drive unit of air conditioner compressor
  62
• 3.2 Assembly overview - belt pulley
  63
• 3.3 Removing air conditioner compressor from and installing on bracket
  63
• 3.4 Removing and installing air conditioner compressor
  65
• 3.5 Removing and installing belt pulley
  69
• 3.6 Checking excess pressure relief valve on air conditioner compressor
  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
  76
• 4.4 Removing and installing fresh air and air recirculation flap control motor V154
  84
• 4.5 Removing and installing fresh air/recirculated air, air flow flap control motor V425
  86
• 4.6 Removing and installing air distribution flap control motor V428
  89
• 4.7 Locally manufacturing an adapter cable to activate control motors
  92
• 5 Front heater and air conditioning unit
  93
• 5.1 Assembly overview - heater and air conditioning unit
  93
• 5.2 Removing and installing heater and air conditioning unit
  102
• 5.3 Dismantling and assembling heater and air conditioning unit
  106
• 5.4 Removing and installing fresh air blower V2
  108
• 5.5 Removing and installing fresh air blower series resistor with overheating fuse N24
  111
• 5.6 Removing and installing dust and pollen filter
  113
• 5.7 Dismantling and assembling evaporator housing
  115
• 5.8 Checking auxiliary air heater element Z35
  117
• 5.9 Removing and installing auxiliary air heater element Z35
  121
• 5.10 Checking condensation drainage
  122
• 5.11 Removing and installing fresh air blower control unit J126
  122
• 5.12 Removing and installing heat exchanger
  124
• 5.13 Removing and installing evaporator temperature sensor G308
  127
• 5.14 Removing and installing flexible shaft
  129
• 6 Air duct
  130
• 6.1 Assembly overview - air duct and air distribution in passenger compartment
  130
• 6.2 Removing and installing centre vent at front
  131
• 6.3 Removing and installing right or left vent
  132
• 6.4 Removing and installing driver side footwell vents
  132
• 6.5 Removing and installing front passenger side footwell vents
  133
• 6.6 Removing and installing rear footwell vent
  134
• 6.7 Removing and installing exhaust ventilation for passenger compartment
  135
• 6.8 Checking exhaust ventilation for passenger compartment
  136
• 6.9 Removing and installing fresh air intake
  137
• 6.10 Removing and installing air duct for defroster vent
  139
• 6.11 Removing and installing air duct for centre vent
  140
• 7 Operating and display unit
  141
• 7.1 Exploded view of fitting locations - operating and display unit
  141
• 7.2 Removing and installing operating and display unit
  144
• 7.3 Multi-pin connector pin assignment on back of operating and display unit
  147
• 8 Other controlling and regulating components
  148
• 8.1 Removing and installing sunlight penetration photosensor G107
  148
• 8.2 Removing and installing centre vent temperature sender G191
  149
• 8.3 Removing and installing footwell vent temperature sender G192
  150
• 8.4 Removing and installing radiator fan control unit J293
  150
• 8.5 Removing and installing ambient temperature sensor G17
  152