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
• 1.3 Safety precautions when working on the cooling system
  1
• 2 General information
  3
• 2.1 Notes concerning odours in air conditioned vehicles
  3
• 2.2 Notes for vehicles with start-stop system
  3
• 3 Repair instructions
  4
• 3.1 Working on refrigerant circuit
  4
• 3.2 General repair instructions
  4
• 3.3 Refrigerant circuit seals
  4
• 3.4 Checking cooling output
  5
• 3.5 Notes on control motors
  6
• 4 Technical data
  12
• 4.1 Capacities for refrigerant R134a
  12
• 4.2 Refrigerant oil
  12
• 4.3 Oil distribution
  12
• Heating
  14
• 1 Heating
  14
• Air conditioning system
  15
• 1 Overview of fitting locations - air conditioning system
  15
• 1.1 Overview of fitting locations - components not located in passenger compartment
  15
• 2 Refrigerant circuit
  24
• 2.1 System overview - refrigerant circuit
  24
• 2.2 Assembly overview - condenser
  25
• 2.3 Removing and installing high-pressure sender G65
  26
• 2.4 Removing and installing expansion valve
  27
• 2.5 Removing and installing condenser
  29
• 2.6 Removing and installing desiccant bag or cartridge
  31
• 2.7 Removing and installing evacuating and charging valves on low and high-pressure side
  36
• 3 Air conditioner compressor
  38
• 3.1 Assembly overview - drive unit of air conditioner compressor
  38
• 3.2 Assembly overview - pulley
  39
• 3.3 Removing air conditioning compressor from and installing on bracket
  40
• 3.4 Removing and installing air conditioner compressor
  41
• 3.5 Checking high-pressure safety valve on air conditioner compressor
  45
• 3.6 Removing and installing pulley
  46
• 4 Control motors
  48
• 4.1 Overview of fitting locations – front control motors
  48
• 4.2 Removing and installing temperature flap control motor V68
  50
• 4.3 Removing and installing defroster flap control motor V107
  52
• 4.4 Removing and installing air recirculation flap control motor V113
  54
• 4.5 Removing and installing rear temperature flap control motor V137
  55
• 4.6 Removing and installing left temperature flap control motor V158
  56
• 4.7 Removing and installing right temperature flap control motor V159
  58
• 4.8 Removing and installing fresh air/air recirculation, air flow flap control motor V425
  60
• 4.9 Removing and installing front air distribution flap control motor V426
  61
• 4.11 Removing and installing air distribution flap control motor V428
  63
• 5 Front heater and air conditioning unit
  64
• 5.1 Removing and installing auxiliary air heater element Z35
  64
• 5.2 Removing and installing heater and air conditioning unit
  65
• 5.3 Dismantling and assembling heater and air conditioning unit
  69
• 5.4 Removing and installing dust and pollen filter
  74
• 5.5 Removing and installing fresh air blower V2
  75
• 5.6 Removing and installing heat exchanger
  76
• 5.7 Removing and installing evaporator temperature sensor G308
  79
• 5.8 Removing and installing condensation drain
  79
• 5.9 Checking condensation drain
  80
• 5.10 Removing and installing fresh air blower series resistor with overheating fuse N24
  81
• 5.11 Removing and installing glove box cooling
  81
• 6 Rear heater and air conditioning unit
  83
• 6.1 Assembly overview - heater and air conditioning unit
  83
• 6.2 Removing and installing heater and air conditioning unit
  84
• 6.3 Dismantling and assembling heater and air conditioning unit
  87
• 6.4 Removing and installing rear fresh air blower V80
  87
• 6.5 Removing and installing rear fresh air blower control unit J391
  88
• 6.6 Removing and installing heat exchanger
  88
• 7 Air duct
  90
• 7.1 Removing and installing air ducts
  90
• 7.2 Removing and installing forced ventilation for passenger compartment
  95
• 7.3 Checking forced ventilation for passenger compartment
  96
• 7.4 Removing and installing fresh air intake
  96
• 7.5 Removing and installing vents
  97
• 8 Coolant circuit
  104
• 8.1 Checking 2nd heat exchanger switch-off valve N317
  104
• 8.2 Removing and installing 2nd heat exchanger switch-off valve N317
  105
• 9 Operating and display unit
  108
• 9.1 Overview of operating and display unit
  108
• 9.2 Removing and installing operating and display unit
  119
• 10 Other controlling and regulating components
  123
• 10.1 Removing and installing sunlight penetration photosensor G107
  123
• 10.2 Principle of operation of air quality sensor G238
  124
• 10.3 Removing and installing air quality sensor G238
  125
• 10.4 Removing and installing ambient temperature sensor G17
  125
• 10.5 Removing and installing left vent temperature sender G150
  126
• 10.6 Removing and installing right vent temperature sender G151
  126
• 10.7 Removing and installing left footwell vent temperature sender G261
  127
• 10.8 Removing and installing right footwell vent temperature sender G262
  127
• 10.9 Removing and installing rear vent temperature sender G174
  128