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Block diagram of auxiliary heater > < Assembling auxiliary heater control unit J364 and burner element

A3 Mk2

Removing and installing overheating fuseS24 / overheating sensorG189 and temperature sensorG18
Removing and installing overheating fuse -S24- / overheating sensor -G189- and temperature sensor -G18-
  Note
t  Depending on version of auxiliary heater control unit -J364-, overheating fuse -S24- may also be referred to as overheating sensor -G189-.
   
t  Overheating fuse -S24--C-, temperature sensor -G18--D- and corresponding wiring form one unit and can only be renewed together.
t  Theoverheating fuse -S24- / overheating sensor -G189--C- and temperature sensor -G18--D- are only inserted in the housing. After a lengthy operating period, O-rings fitted as seals may however stick to housing.
t  From model year 2006 onwards, auxiliary heaters with an improved overheating fuse -S24- / overheating sensor -G189- and an improved temperature sensor -G18- are gradually being introduced (better protection of wiring against ingress of moisture).
–  Remove auxiliary heater → Chapter.
–  Detach add-on components from auxiliary heater → Chapter.
–  Detach both coolant hose connections from auxiliary heater → Chapter.
–  Detach both plastic covers from auxiliary heater → Chapter (dismantling and assembling auxiliary heater).
Removing
  A82-0493
–  Remove bolt -A- and detach clip -B-.
–  Carefully pull the overheating fuse -S24- / overheating sensor -G189--Item C- and the temperature sensor -G18--D- out of the auxiliary heater (e.g. by applying gripping pliers directly to the housing). In doing so, take care not to damage components which are to be re-used.
–  Unplug connector -F- from auxiliary heater control unit -J364-.
Installing
–  Check and clean both openings in the outer casing of the auxiliary heater into which the temperature sensor -G18--D- and the overheating fuse -S24- / overheating sensor -G189--C- are inserted. Also check the contact surfaces at the heat exchanger for these components (via the two openings in the auxiliary heater).
–  Attach one new O-ring -E- to theoverheating fuse -S24- / overheating sensor -G189--C- and the temperature sensor -G18--D-
–  Before installing, lubricate both O-rings -E-, e.g. with coolant.
–  Insert overheating fuse -S24- / overheating sensor -G189--C- and temperature sensor -G18--D-.
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–  Insert clip -B- in correct position and fit bolt -A-.
–  Route wiring to connector -F- as shown and plug in connector -F-.
  Note
From model year 2006 onwards, auxiliary heaters are gradually being introduced on which the wiring is routed on the opposite side to that shown, i.e. at the attachment point for the bracket of the connection.
–  Re-assemble auxiliary heater.
–  Re-install auxiliary heater and all components removed in reverse order.
  A82-0493

Block diagram of auxiliary heater > < Assembling auxiliary heater control unit J364 and burner element