The air conditioning system
106
Auxiliary heating (auxiliary heating and ventilation)*
Description and important information
The auxiliary heating (auxiliary he ating and ventilation) heats or
supplies the interior of the vehicl e with fresh air independent of the
engine.
Auxiliary heating (auxiliary heating)
The auxiliary heating (auxiliary heating) func tions in connection with the Climatic or
Climatronic.
It can be used when stationary, when engi ne is switched off for preheating of the
vehicle as well as while driving (e.g. during the heating phase of the engine).
The auxiliary heating (auxiliary heating) warms up the coolant during the combus-
tion of fuel from the vehicle tank. The coolant warms up the air, which (if the blower
speed is not set to zero) flows into the occupant compartment.
10)
Auxiliary ventilation
The auxiliary ventilation enables fresh air to flow into the vehicle interior by
switching off the engine, whereby the interior temperature is effectively decreased
(e.g. with the vehicle parked in the sun).
WARNING
•The auxiliary heating must never be op erated in closed rooms - risk of
poisoning!
•The auxiliary heating must not be running during refueling - risk of fire.
•The exhaust pipe of the auxiliary heating is located on the underside of
the vehicle. Therefore do not place the vehicle, if you wish to operate the
auxiliary heating, in such a way that the exhaust gases of the auxiliary
heating can come easily into contact with inflammable materials (e.g. dry
grass) or easily inflammable substances (e.g. fuel run out).
Note
•If the auxiliary heating runs, the fuel consumption comes from the vehicle tank.
Therefore the auxiliary heating should not be operated, if there is very little fuel in
the tank.
•The exhaust pipe of the auxiliary heatin g, which is located on the underside of
the vehicle, must not be clogged and the exhaust flow must not be blocked.
•If the auxiliary heating and ventilation is running, the vehicle battery discharges.
If the auxiliary heating and ventilation has been operated several times over a
longer period, the vehicle must be driven a few kilometers in order to recharge the
vehicle battery.
•The auxiliary heating only switches the blower on, if it has achieved a coolant
temperature of approx. 50 °C.
•At low outside temperatures, this can result in a formation of water vapour in
the area of the engine compartment. This is quite normal and is not an operating
problem.
•After switching off the auxiliary heating, the coolant pump runs for a short
period.
•The auxiliary heating and ventilation does not switch on or comes on, if the
vehicle battery indicates a low loading state.
•The auxiliary heating (auxiliary heating) switches off, if in the information
display: Please refuel! is indicated or wa s indicated before switching off the igni-
tion.
•When driving, the auxiliary heating can only be switched on, if the exterior
temperature is lower than 5 °C.
•The air inlet in front of the windscreen must be free of ice, snow or leaves in
order to ensure that the auxili ary heating operates properly.
•So that warm air can flow into the vehi cle interior after switching on the auxil-
iary heating, you must maintain the te mperature normally selected by you (we
recommend 22°C). It is recommended to put the air flow in the position
.
•On vehicles with DPF (diesel particle filter) the warm coolant heats up the
engine.
10)However the coolant does not warm up the engine.
NKO B6 20.book Page 106 Wednesday, March 26, 2008 3:15 PM
Fuses and light bulbs243
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
F12Lambda probe10
F13Control unit for automatic gearbox15
F14Not assigned
F15Water pump10
F16Not assigned
F17Instrument cluster, windshield wiper lever and turn sig-
nal light lever5
F18Audio amplifier (sound system)30
F19Radio15
F20Phone5
F21Not assigned
F22Not assigned
F23Engine control unit10
F24Control unit for CAN databus5
F25Not assigned
F26Not assigned
F27Va lve for fuel d osi ng15
F28Engine control unit15
F29Main relay5
F30Control unit for auxiliary heating20
F31Front window wiper30
F32Not assigned
F33Not assigned
F34Not assigned
F35Not assigned
No.Power consumerAmperes
F36Not assigned
F37Not assigned
F38Radiator fan, valves10
F39Not assigned
F40Not assigned
F41Not assigned
F42Not assigned
F43Ignition30
F44Not assigned
F45Not assigned
F46Not assigned
F47Front left main headlight, left rear light unit30
F48Pump for ABS40
F49Not assigned
F50Not assigned
F51Not assigned
F52Power supply relay - terminal a)40
F53Accessory equipment50
F54Not assigned
a)In order not to drain the battery unnecessarily when starting the engine, the electrical com-
ponents of this terminal are automatically switched off.
No.Power consumerAmperes
NKO B6 20.book Page 243 Wednesday, March 26, 2008 3:15 PM
Fuses and light bulbs
244
Fuse assignment in engine compartment - version 2
Certain electrical components are only st andard on certain vehicle model versions
or only suppliable as optional equipment for certain models.
No.Power consumerAmperes
F1Not assigned
F2Control unit for automatic gearbox DQ20030
F3Measuring circuit5
F4Valves for ABS30/20
F5Control unit for automatic gearbox DQ25015
F6Instrument cluster, windshield wiper lever and turn sig-
nal light lever5
F7Power supply for terminal 15 (ignition on)40
F8Radio15
F9Phone5
F10Engine control unit, Main relay5/10
Fig. 215 Schematic repre-
sentation of fuse box in
engine compartment -
version 2
F11Control unit for auxiliary heating20
F12Control unit for CAN databus5
F13Engine control unit15/30
F14Ignition20
F15Lambda probe - Petrol
Glow plug system relay and fuel pump - Diesel10
5
F16Front right main headlight, right rear light unit30
F17Horn15
F18Audio amplifier (sound system)30
F19Front window wiper30
F20Valve for fuel dosing
water pump20
10
F21Lambda probe10/15
F22Not assigned
F23Main relay
Valves
High pressure pump5
10
15
F24Fa n10
F25Pump for ABS30/40
F26Left main headlight30
F27Control unit for glow plug system50
F28Not assigned
F29Accessory equipment50
F30Power supply relay - terminal X a)50
a)In order not to drain the battery unnecessarily when starting the engine, the electrical com-
ponents of this terminal are automatically switched off.
No.Power consumerAmperes
NKO B6 20.book Page 244 Wednesday, March 26, 2008 3:15 PM
