Auxiliary heater

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety precautions during work on fuel system
  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 for working on vehicles with auxiliary/supplementary heater
  2
• 2 General information
  4
• 2.1 Starting conditions for auxiliary/supplementary heater
  4
• 2.2 Notes for vehicles with a start/stop system
  4
• 2.3 Type plates
  5
• 3 Repair notes
  7
• 3.2 Rules for cleanliness when working on fuel supply system
  7
• 3.3 Notes on general repairs on vehicles with auxiliary/supplementary heater
  7
• Supplementary heating
  9
• 1 Overview of fitting locations – auxiliary/supplementary heater
  9
• 2 Auxiliary/supplementary heater
  12
• 2.1 Overview of fitting locations – auxiliary/supplementary heater
  12
• 2.2 Assembly overview – auxiliary/supplementary heater, interior
  14
• 2.3 Removing and installing auxiliary/supplementary heater
  19
• 2.4 Dismantling and assembling auxiliary/supplementary heater
  25
• 2.5 Removing and installing air intake silencer
  28
• 2.6 Removing and installing recirculation pump V55
  30
• 2.7 Removing and installing silencer with bracket
  34
• 2.8 Removing and installing heater coolant shut-off valve N279
  35
• 2.9 Coolant temperature sender for heater G241
  39
• 2.10 Removing and installing glow plug with flame monitor Q8, from model year 2017
  40
• 2.12 Pin assignment of auxiliary/supplementary heater
  41
• 2.14 Dismantling and assembling burner unit, from model year 2017
  44
• 3 Coolant circuit with auxiliary/supplementary heater
  46
• 3.1 Coolant hose connection diagram
  46
• 4 Fuel supply system
  56
• 4.1 Overview of fitting locations - fuel supply system
  56
• 4.2 Checking fuel delivery rate
  58
• 4.3 Removing and installing metering pump V54
  61
• 5 Regulation of auxiliary/supplementary heater
  65
• 5.1 Functional description
  65
• 5.2 Supplementary heater mode
  65
• 6 Other controlling and regulating components
  66
• 6.1 Removing and installing roof display unit J702
  66
• 6.2 Removing and installing remote control receiver for auxiliary coolant heater R149
  67
• 6.3 Removing and installing ambient temperature sensor G17
  69
• 6.4 Functional description of remote control for auxiliary/supplementary heater
  69