Audi a3 8p AUDI A8 2003 D3 / 2.G Technical Features Manual

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Small coolant circuit with auxiliary heater
The small coolant circuit employed with
auxiliary heating is designed to ensure rapid
warming of the passenger compartment.
With the engine stopped, the coolant shutoff
valve N279 switches to the small heating
circuit until a defined temperature value has
been attained. The coolant exiting from the
heat exchangers via the pump/valve unit is
conveyed by the circulation pump V55 into
the auxiliary heater. After being warmed, the
coolant is pumped back into the heat
exchangers and initially heats the passenger
compartment.
Heating/Air Conditioner
SSP282_097
Design and operation are described in
SSP 267 – The 6.0 l W12 engine in the
Audi A8 - Part 1.
Coolant shutoff
valve N279
Circulation pump V55Auxiliary heater with
additional heater control unit J364
Non-return valve 2
Continued coolant
circulation pump V51 Tempera-
ture
senderPump/valve unit with
heating-system heat
exchangers Cap
Coolant
circulation
pump V50

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For internal use only All rights reserved. Subject to
technical modification.
Copyright* 2002 AUDI AG, Ingolstadt
Department I/VK-35
D-85045 Ingolstadt
Fax 0841/89-36367
000.2811.02.20
Technical status as at 09/02
Printed in Germany
AUDI A8 ´03 - Technical Features
Self Study Programme 282
282
282