Repairing auxiliary air heater — VW

Repairing auxiliary air heater
Caution
Before working on the auxiliary heater and/or the fuel system, pull out the appropriate fuses
Current flow diagrams, Electrical fault finding and Fitting locations
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Note
A manufacturer's plate is attached to the heater unit. This plate gives details of the heater unit type installed in the vehicle
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In the event of a malfunction, interrogate the fault memory using
basic unit
VAS 5019/1
before taking any further measures
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Heater unit
Removal
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Dismantling and assembling
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Hexagon nut M6
6 Nm
Front mounting angle bracket
Intake duct
Heater control unit
J65
In vehicles ▸ 08.99: in the intake duct
Item
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Removal
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Points to be observed
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Lower elbow
Seal
Seal
Intermediate piece
Clip
Intake duct for hot air
Clip
Vent
Various forms possible depending on model.
Removing, vehicles with camping equipment
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Removing, vehicles without camping equipment
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Outlet duct
Removal
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Clip
Hot air hose
Combustion air intake connection
Removal
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Combustion air intake hose
Removal
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Combustion air pipe connection
Removal
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Clip
Exhaust pipe
Removing and installing exhaust system
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Clip
Silencer
Removing and installing exhaust system
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Silencer bracket
Rear mounting angle bracket
Fuel pump
G23
Dismantling
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Checking installation position
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Checking fuel quantity delivered
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Printed circuit board for temperature sensor, blower motor and glow plug duty cycle control unit
J372
In vehicles 09.99 ▸: In the heater unit
Item
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Removal
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Bracket
Removing: Remove heater unit first
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Removing
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Plug mantle
Remove deposits with brass wire brush (spark plug brush) or renew if necessary.
Different versions for diesel and petrol.
Removing and installing
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Glow plug for heater
Q9
20 Nm
Removing and installing
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Checking
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Cap
Removal
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Temperature sensor
G18
Only installed in vehicles with camping equipment, in all other vehicles the temperature sensor is located on the printed circuit board for temperature sensor, blower motor and glow plug duty cycle control unit
J372
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In the right-hand C pillar trim.
The heat output is dependent upon the setting of the temperature control switch and the temperature measured at the temperature sensor.
Removing and installing
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Fuses
For vehicles with camping equipment: Renew
“S1”
and
“S4”
in the fuse box
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For vehicles without camping equipment: ▸ 12.95
S129
and
S23
, under the driver's seat. For vehicles 01.96 ▸:
S66
and
S23
, under the driver's seat.
Operating and display unit for camping equipment
E153
Only installed in vehicles with camping equipment.
Removing and installing:
Rep. Gr.
76
Pre-selection clock
E111
Only installed in certain vehicles with camping equipment as an optional extra ▸ 12.95.
Removal
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Heating/temperature/time control switch
E13
Only installed in vehicles without camping equipment ▸ 12.95.
In certain models, a combination of temperature control switch and
pre-selection clock
E111
▸ 12.95 is installed as an optional extra.
Removal
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Pre-selection clock with temperature regulator
E187
Only installed in vehicles from 01.96 to 08.98.
Removal
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Operation and function
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Pre-selection clock with temperature regulator
E187
Vehicles 09.98 ▸.
Removal
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Operation and function
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