Incorporation Of Auxiliary/Additional Heater Into Coolant Circuit; Incorporation Of Supplementary Heater Into Coolant Circuit - Audi 2003 A8 Workshop Manual

8 Incorporation of auxiliary/additional
heater into coolant circuit
Note
Up to Model Year 2005, auxiliary/supplementary heaters were
fitted on which there was a delay of 10 seconds between the re‐
ception of a corresponding request from the front operating and
display unit, Climatronic control unit -J255- and implementation
of the heating mode deactivation time by the supplementary heat‐
er control unit -J364- . With such auxiliary/supplementary heaters,
there is a risk of overheating of the coolant in the auxiliary heater
under certain usage conditions. In the event of a complaint of this
nature, the adaption is therefore to be checked and corrected if
necessary ⇒ "Guided fault-finding" function of vehicle diagnostic,
testing and information system VAS 5051.
8.1 Incorporation of supplementary heater
into coolant circuit
Note
Vehicles with diesel engine without "Auxiliary heater" optional
♦
extra are fitted with additional heater (auxiliary heater without
circulation pump -V55- ).
If vehicles with diesel engine are fitted with auxiliary heater as
♦
optional extra, this is also actuated as additional heater.
For all components not mentioned, refer to ⇒ Engine, me‐
♦
chanics; Rep. Gr. 19 .
Tubing from engine to additional heater and from pump/valve
♦
unit to engine differs depending on engine version. ⇒ Engine,
mechanics; Rep. Gr. 19
⇒Direction of coolant flow (with engine running and in additional
heater mode)
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with respect to the correctness of information in this document. Copyright by AUDI AG.

8. Incorporation of auxiliary/additional heater into coolant circuit

Audi A8 2003 ➤
Auxiliary Heater - Edition 03.2008
53