Audi A4 2001 - Additional Heater System Operation

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Additional heater
Heater/AC
The Audi A4 can optionally be equipped with
an additional heater for coolant.
Its mode of operation corresponds to the
systems in use previously.
The additional heater warms the heating-
system heat exchanger in the air conditioner
unit via the cooling-water circuit.
The cut-in time is ”programmed” via the dash
panel insert.
Flame sensor
Fan
drive
Diffuser
Fuel tank
Combus-
tion air
Control and heater
unit for heating
system J162
Heating system
heat exchanger
Exhaust
gas
Combustion chamber
Glow plug
Fuel pump
SSP254_023
SSP254_097