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 cooling system
  1
• 2 General notes
  3
• 2.1 Notes concerning odours in air conditioned vehicles
  3
• 2.2 Notes for vehicles with 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 Heating
  6
• Air conditioning system
  7
• 1 Overview of fitting locations - air conditioning system
  7
• 1.1 Overview of fitting locations - components not located in passenger compartment
  7
• 2 Refrigerant circuit
  11
• 2.1 System overview - refrigerant circuit
  11
• 2.2 Removing and installing condenser
  12
• 2.3 Removing and installing restrictor
  13
• 2.4 Removing and installing refrigerant pressure and temperature sender G395
  14
• 2.5 Quick release coupling
  16
• 2.6 Removing and installing evacuating and charging valves on low and high-pressure side
  19
• 2.7 Removing and installing drier
  21
• 3 Air conditioner compressor
  24
• 3.1 Removing and installing air conditioner compressor
  24
• 3.2 Removing and installing freewheel on air conditioner compressor
  28
• 3.3 Checking excess pressure relief valve on air conditioner compressor
  31
• 3.4 Ancillary bracket
  31
• 4 Control motors
  44
• 4.1 Overview of fitting locations - front control motors
  44
• 4.2 Removing and installing air flow flap control motor V71
  46
• 4.3 Removing and installing defroster flap control motor V107
  47
• 4.4 Removing and installing left footwell flap control motor V108
  47
• 4.5 Removing and installing right footwell flap control motor V109
  48
• 4.6 Removing and installing air recirculation flap control motor V113
  49
• 4.7 Removing and installing front cold air flap control motor V197
  50
• 4.8 Removing and installing front warm air flap control motor V198
  51
• 4.9 Removing and installing front right defroster and chest vent shut-off flap control motor V199
  51
• 4.10 Removing and installing front left defroster and chest vent shut-off flap control motor V200
  52
• 4.13 Removing and installing right defroster and chest vent flap control motor V205
  53
• 4.14 Removing and installing left defroster and chest vent flap control motor V206
  54
• 4.15 Removing and installing right B-pillar and footwell shut-off flap control motor V211
  54
• 5 Front heater and air conditioning unit
  56
• 5.1 Assembly overview - distribution box in rear left or right footwell
  56
• 5.2 Removing and installing heater and air conditioning unit
  57
• 5.3 Removing and installing evaporator temperature sensor G308
  62
• 5.4 Dismantling and assembling air distribution housing
  62
• 5.5 Removing and installing evaporator
  63
• 5.6 Dismantling and assembling lower part of housing
  65
• 5.7 Assembly overview - evaporator and covers in plenum chamber
  67
• 5.8 Checking, removing and installing water drain hose with valve
  68
• 5.9 Removing and installing dust and pollen filter
  71
• 5.10 Removing and installing fresh air blower V2
  71
• 5.11 Removing and installing fresh air blower control unit J126
  72
• 5.12 Removing and installing heat exchanger
  73
• 5.13 Removing and installing pump-valve unit
  81
• 5.14 Checking condensation drainage
  89
• 5.15 Removing and installing condensate drain hose
  91
• 6 Air duct
  92
• 6.1 Assembly overview - air duct and air distribution in passenger compartment
  92
• 6.2 Removing and installing left design trim control motor V207
  94
• 6.3 Removing and installing left dash panel vent
  94
• 6.4 Removing and installing right design trim control motor V209
  95
• 6.5 Removing and installing right dash panel vent
  96
• 6.6 Removing and installing centre design trim control motor V208
  98
• 6.7 Removing and installing centre dash panel vent
  98
• 6.8 Removing and installing defroster vent panel
  100
• 6.9 Removing and installing air distribution housing in centre of dash panel
  101
• 6.10 Assembly overview - air distribution housing in dash panel centre
  101
• 6.11 Renewing design trim bearings
  103
• 6.12 Assembly overview - fresh air blower
  104
• 6.13 Removing and installing intake duct with air flow flap
  106
• 6.14 Removing and installing rear vent
  107
• 6.15 Checking exhaust ventilation for passenger compartment
  108
• 7 Operating and display unit
  109
• 7.1 Overview of operating and display unit
  109
• 7.2 Removing and installing Climatronic control unit J255
  112
• 7.3 Connectors on Climatronic control unit J255
  114
• 7.4 Removing and installing rear operating and display unit
  121
• 8 Other controlling and regulating components
  123
• 8.1 Removing and installing ambient temperature sensor G17
  123
• 8.2 Removing and installing dash panel temperature sensor G56
  124
• 8.3 Removing and installing fresh air intake duct temperature sensor G89
  125
• 8.4 Removing and installing photo sensor 2 for sunlight penetration G134
  125
• 8.5 Removing and installing centre vent temperature sender G191
  126
• 8.6 Removing and installing air quality sensor G238
  127
• 8.7 Working principles of air quality sensor G238
  127
• 8.10 Removing and installing humidity sender G355
  130
• 8.11 Removing and installing rear left defroster button E299 and rear right defroster button E300
  131
• 8.12 Removing and installing front left vent button E301
  132