Audi Air conditioning 2003 A8 Workshop Manual page 62

Audi A8 2003 ➤
Air conditioning - Edition 09.2010
– Complete bleeding of coolant circuit ⇒ Engine, mechanics;
Rep. gr. 19
Note
Bleed the coolant circuit again if necessary, paying attention
♦
to the notes ⇒ page 132
If the coolant circulation pump -V50- is noisy, check for com‐
♦
plete bleeding of the cooling system prior to removal of the
pump valve unit (noise may be caused by air in the coolant
circuit): ⇒ Engine, mechanics; Rep. gr. 19
The valves of the pump valve unit are open when deenergised.
♦
If the power supply or the valve connection to the front oper‐
ating and display unit, Climatronic control unit -J255- is inter‐
rupted, the air conditioner heat output cannot be regulated.
5.18.1 Removing
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Special tools and workshop equipment required
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with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Hose clamps -3090 bzw. 3094-
♦ Compressed air gun, commercially available
♦ Hand pump -V.A.G 1274- (and appropriate adapters)
– Switch off ignition.
– Remove the plenum chamber cover on the right.
– Dissipate the pressure in the coolant circuit by opening the cap
at the coolant expansion tank ⇒ Engine, mechanics; Rep. gr.
19 .
– Mark the arrangement of the coolant hoses -A- (supply to
pump valve unit) and -B- (return to engine).
– Pinch off both coolant hoses between the engine and pump
valve unit (e.g. using hose clamps -V.A.G 3094- ).
– Detach the coolant hoses -A- and -B- from the connections.
– Connect one tubing section -A- and -B- to each of the two
connections.
– Place a vessel -C- beneath the hose -B-.
– Use a compressed-air gun to carefully blow coolant out of the
heat exchanger and pump valve unit (into the vessel).
56
Rep. gr.87 - Air conditioning system
.