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Dismantling and assembling heater unit -B4W- (petrol) > < Repairing auxiliary heater -B4W- / -D4W-

Leon Mk2

Removing and installing heater unit -B4W- / -D4W-
Removing and installing heater unit -B4W- / -D4W-
Special tools and workshop equipment required
   
t  Torque wrench -V.A.G 1410- (4…20 Nm)
  W00-0554
t  Hose clamps up to 25 mm Ø -3094-
  Note
Drain coolant before removing. Fill with new coolant after installing and bleed coolant circuit according to instructions → Chapter.
  W00-0079
1 - Longitudinal member
2 - Blind rivet nut M8
3 - Fuel line
q   From metering pump to heater unit
4 - Coolant hose, supply
5 - Bracket for heater unit
6 - Hexagon bolt M8×20
q   10 Nm
7 - Exhaust system
8 - Hexagon bolt M6×16
q   6 Nm
9 - Hexagon nut M8
q   10 Nm
10 - Clamping plate
11 - Bracket
12 - Self-tapping screw 4.8x16
13 - Coolant hose, return
14 - Self-tapping screw 4.8x16
15 - Intake hose
q   Securing → Fig..
16 - Heater unit -B4W- / -D4W-
q   With heater control unit -J162-
q   Dismantling and assembling → Chapter
q   Removing
  WARNING
Danger of scalding injuries.
When the engine is warm, the coolant temperature may be above 100 °C. The cooling system is pressurised.
If necessary, release pressure and reduce temperature before carrying out repairs.
q   Open radiator cap.
q   Clamp off coolant hoses to heater unit with hose clamps up to Ø 25 mm -3094- and unfasten hoses.
  WARNING
Danger of fuel escaping.
Fuel system is under pressure.
Before opening system, wrap a cloth around the connection. Then release pressure by carefully loosening the connection.
q   Disconnect fuel line at heater unit and seal.
q   Disconnect 8-pin connector (T8) from heater control unit -J162-.
  WARNING
Danger of burn injuries.
Parts of the exhaust system may be hot.
Before removing exhaust system, let it cool off.
q   Unfasten silencer on bracket.
q   Unscrew heater unit with bracket for heater unit.
q   Secure intake hose → Fig..

   
Securing intake hose
1 - Heater unit
2 - Longitudinal member
3 - Bracket
4 - Screw-type clip
5 - Intake hose
6 - Sealing ring
–  Push intake hose -5- in direction of -arrow A- until it makes contact with housing of heater unit -1-.
–  Fasten screw-type clip -4-.
–  Push intake hose through sealing ring -6- into bulkhead -arrow B- up to stop.
–  Insert intake hose into bow of bracket -3-.
  N82-0131

Dismantling and assembling heater unit -B4W- (petrol) > < Repairing auxiliary heater -B4W- / -D4W-