Heating, air conditioning

Chapter overview

• Technical data
  1
• 1 Notes on safety
  1
• 1.1 Safety precautions when working on air conditioning systems
  1
• 1.2 Safety measures for when working on vehicles with a start-stop system
  1
• 1.3 Safety precautions when working on the cooling system
  1
• 2 General notes
  3
• 2.1 Notes concerning odours in air conditioned vehicles
  3
• 2.2 Notes for vehicles with a start-stop system
  3
• 3 Repair notes
  4
• 3.1 Working on refrigerant circuit
  4
• 3.2 Refrigerant circuit seals
  4
• 4 Technical data
  5
• 4.1 Capacities for refrigerant R134a
  5
• 4.2 Refrigerant oil
  5
• 4.3 Oil distribution
  5
• Heating
  6
• 1 Overview of fitting locations - heating
  6
• 2 Heater unit
  8
• 2.1 Removing and installing heater unit
  8
• 2.2 Dismantling and assembling heater unit
  11
• 2.3 Removing and installing heat exchanger
  12
• 2.4 Removing and installing auxiliary air heater element Z35
  12
• 2.5 Removing and installing fresh air blower V2
  12
• 2.6 Removing and installing fresh air blower series resistor with overheating fuse N24
  12
• 2.7 Removing and installing dust and pollen filter
  12
• 3 Control motors
  13
• 3.1 Removing and installing flexible shaft for air distribution
  13
• 3.2 Removing and installing Bowden cable for temperature flap
  14
• 3.4 Removing and installing air distribution flap actuator
  14
• 3.5 Removing and installing temperature flap actuator
  15
• 4 Air duct
  16
• 4.1 Removing and installing fresh air intake
  16
• 4.2 Checking exhaust ventilation for passenger compartment
  16
• 4.3 Removing and installing centre vent
  16
• 4.4 Removing and installing vent on driver or front passenger side
  16
• 4.5 Removing and installing rear footwell air duct
  16
• 4.6 Removing and installing front passenger side footwell vents
  16
• 4.7 Removing and installing driver side footwell vents
  16
• 5 Operating and display unit
  17
• 5.1 Removing and installing operating and display unit
  17
• 5.2 Removing and installing connectors on operating and display unit
  17
• Air conditioning system
  19
• 1 Overview of fitting locations - air conditioning system
  19
• 2 Refrigerant circuit
  30
• 2.1 System overview - refrigerant circuit
  30
• 2.2 Removing and installing high-pressure sender G65
  31
• 2.3 Removing and installing expansion valve
  32
• 2.4 Removing and installing condenser
  35
• 2.5 Removing and installing desiccant bag or cartridge
  38
• 2.6 Removing and installing receiver
  40
• 2.7 Removing and installing evacuating and charging valves on low and high-pressure side
  41
• 3 Air conditioner compressor
  44
• 3.1 Assembly overview - drive unit of air conditioner compressor
  44
• 3.2 Assembly overview - belt pulley
  46
• 3.3 Removing and installing ancillary bracket for air conditioner compressor
  48
• 3.4 Removing and installing air conditioner compressor
  56
• 3.5 Removing air conditioner compressor from and installing on bracket
  60
• 3.6 Checking excess pressure relief valve on air conditioner compressor
  62
• 3.7 Removing and installing belt pulley
  63
• 4 Control motors
  65
• 4.1 Removing and installing temperature flap control motor V68
  65
• 4.2 Removing and installing air flow flap control motor V71
  67
• 4.3 Removing and installing central flap control motor V70
  70
• 4.4 Removing and installing defroster flap control motor V107
  71
• 4.5 Removing and installing air recirculation flap control motor V113
  71
• 4.7 Removing and installing left temperature flap control motor V158
  75
• 4.8 Removing and installing right temperature flap control motor V159
  77
• 4.9 Removing and installing fresh air/recirculated air, air flow flap control motor V425
  77
• 4.10 Removing and installing front air distribution flap control motor V426
  78
• 4.11 Removing and installing air distribution flap control motor V428
  78
• 5 Front heater and air conditioning unit
  80
• 5.1 Assembly overview - evaporator housing
  80
• 5.2 Removing and installing heater and air conditioning unit
  81
• 5.3 Dismantling and assembling heater and air conditioning unit
  86
• 5.4 Removing and installing evaporator
  91
• 5.5 Removing and installing heat exchanger
  92
• 5.6 Removing and installing auxiliary air heater element Z35
  95
• 5.7 Removing and installing fresh air blower V2
  96
• 5.8 Removing and installing fresh air blower series resistor with overheating fuse N24
  97
• 5.9 Removing and installing dust and pollen filter
  98
• 5.10 Checking condensation drainage
  98
• 5.12 Removing and installing glove box cooling
  99
• 6 Air duct
  100
• 6.1 Removing and installing fresh air intake
  100
• 6.2 Checking exhaust ventilation for passenger compartment
  100
• 6.3 Removing and installing centre vent
  101
• 6.4 Removing and installing vent on driver or front passenger side
  101
• 6.5 Removing and installing rear footwell air duct
  102
• 6.6 Removing and installing front passenger side footwell vents
  102
• 6.7 Removing and installing driver side footwell vents
  103
• 7 Operating and display unit
  104
• 7.1 Overview of operating and display unit
  104
• 7.2 Removing and installing operating and display unit
  117
• 7.3 Connectors on operating and display unit
  119
• 7.4 Removing and installing flexible shaft
  121
• 8 Other controlling and regulating components
  123
• 8.2 Function of air quality sensor G238
  123
• 8.3 Removing and installing air quality sensor G238
  125
• 8.4 Removing and installing ambient temperature sensor G17
  126
• 8.5 Removing and installing fresh air intake duct temperature sensor G89
  127
• 8.7 Removing and installing centre vent temperature sender G191
  127
• 8.8 Removing and installing footwell vent temperature sender G192
  128
• 8.9 Removing and installing left footwell vent temperature sender G261
  128
• 8.10 Removing and installing right footwell vent temperature sender G262
  129