Operation Of And Removing/Installing Heater Coolant Shutoff Valve N279 - Audi 2003 A8 Workshop Manual

Audi A8 2003 ➤
Auxiliary Heater - Edition 03.2008
1 - Auxiliary/additional heater
2 - Air conditioner pump/valve
unit
❑ Incorporation into cool‐
ant circuit ⇒ Air condi‐
tioning; Rep. Gr. 87
3 - Right heat exchanger of air
conditioner unit
4 - Left heat exchanger of air
conditioner unit
5 - Heater coolant shutoff valve
-N279-
❑ Removing and installing
⇒ page 58 .
❑ The shutoff valve is ac‐
tuated by the additional
heater control unit -
J364- ⇒ page 112
❑ The illustration shows
the shut-off valve in non-
actuated condition
(coolant flow from con‐
nection "3" to connec‐
tion "4").
❑ Actuation of shutoff
valve causes coolant to
flow from connection "3"
to connection "2"
6 - Coolant return to engine
❑ Incorporation into en‐
gine coolant circuit ⇒
Engine, mechanics;
Rep. Gr. 19
7 - Cap
8 - Coolant supply from engine
❑ Incorporation into engine coolant circuit ⇒ Engine, mechanics; Rep. Gr. 19
9 - Connector for coolant hoses
10 - Circulation pump -V55-
❑ Under certain conditions, circulation pump is also actuated with engine running to assist engine coolant
pump ⇒ page 61
8.4 Operation of and removing/installing
heater coolant shutoff valve -N279-
Function
Note
Currently only fitted to vehicles with "Auxiliary heater" optional
♦
extra.
♦ Not fitted on vehicles with diesel engine on which the auxiliary/
supplementary heater is only used as supplementary heater
(vehicles without "Auxiliary heater" optional extra).
58
Rep. Gr.82 - Auxiliary heating
.
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