Auxiliary heater

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety precautions for working on vehicles with auxiliary heater
  1
• 1.2 Safety measures when working on vehicles with a start/stop system
  2
• 1.3 Safety precautions during work on fuel system
  2
• 1.4 Safety precautions when working on cooling system
  2
• 1.6 Safety precautions when working on high-voltage system
  2
• 1.7 Safety precautions when working in vicinity of high-voltage components
  3
• 2 General information
  4
• 2.1 Starting conditions for auxiliary/supplementary heater
  4
• 2.2 Notes for vehicles with start-stop system
  5
• 2.4 Type plates
  5
• 3 Repair instructions
  7
• 3.1 General repair instructions
  7
• Supplementary heating
  8
• 1 Overview of fitting locations - auxiliary/supplementary heater components
  8
• 1.1 Overview of fitting locations - auxiliary/supplementary heater components
  8
• 2 Auxiliary/supplementary heater
  10
• 2.1 Overview of fitting locations - auxiliary/supplementary heater
  10
• 2.2 Dismantling and assembling auxiliary/supplementary heater
  11
• 2.3 Removing and installing auxiliary/supplementary heater
  14
• 2.4 Removing and installing temperature sensor G18
  17
• 2.5 Removing temperature sensor 2 for supplementary and auxiliary heating G587
  18
• 2.6 Removing and installing glow plug for heater Q9
  19
• 2.7 Removing and installing circulation pump V55
  19
• 2.8 Removing and installing combustion air blower V6
  20
• 2.9 Removing and installing combustion chamber
  21
• 2.10 Removing and installing exhaust system
  23
• 2.11 Removing heat exchanger
  24
• 2.12 Checking flame monitor G64
  25
• 2.13 Removing and installing flame monitor G64
  25
• 2.14 Preliminary work for checking supplementary heater components
  26
• 2.15 Checking glow plug for heater Q9
  27
• 2.16 Checking combustion air blower V6
  28
• 2.17 Checking flame monitor G64
  28
• 2.18 Checking temperature sensor G18
  29
• 2.19 Checking temperature sensor 2 for supplementary and auxiliary heating G587
  30
• 2.20 Checking fuel pre-heating heater element Z66
  31
• 2.21 Removing and installing auxiliary heater control unit J364
  31
• 2.22 Connector pin assignment for auxiliary/supplementary heater
  32
• 3 Coolant circuit with auxiliary/supplementary heater
  34
• 3.1 Connection diagram - coolant hoses
  34
• 3.2 Removing and installing heater coolant shut-off valve N279
  37
• 3.3 Coolant hose routing on vehicles with 2nd heat exchanger
  39
• 4 Fuel supply
  41
• 4.1 Overview of fitting locations - fuel supply system
  41
• 4.2 Removing and installing metering pump V54
  42
• 4.3 Checking fuel delivery rate
  43
• 5 Regulation of auxiliary/supplementary heater
  45
• 5.1 Function description
  45
• 5.2 Supplementary heater mode
  46
• 5.3 Switching off auxiliary/supplementary heater
  46
• 6 Other controlling and regulating components
  47
• 6.1 Functional description of remote control for auxiliary/supplementary heater
  47
• 6.2 Removing and installing remote control receiver for auxiliary coolant heater R149
  49
• 6.3 Removing and installing ambient temperature sensor G17
  50