Removing and installing coolant shut-off valve N82 — AUDI

Removing and installing coolant shut-off valve
N82
Note
N82
A
is currently only fitted in the plenum chamber on the right on vehicles with certain engines (currently fitted for example on vehicles with a 1.8 and 2.0 l TFSI engine)
Rep. gr.
19
Cooling system/coolant; Connection diagram - coolant hoses
If vehicles with an engine for which
N82
is intended are fitted with an auxiliary heater as optional extra,
N82
is not fitted and
N279
is installed instead (a shut-off valve of a different type and with different operation)
Electronic parts catalogue
and
Auxiliary/supplementary heater
Rep. gr.
82
Coolant circuit with auxiliary/supplementary heater; Connection diagram - coolant hoses
.
N82
is open when not actuated to permit checking of the electrical function of the valve. This takes place at certain intervals (e.g. brief actuation for approx. 1 second on every twentieth engine start).
Vehicles with an auxiliary heater are fitted with a
heater coolant shut-off valve
N279
Chapter
“
Incorporation of heater and air conditioner into coolant circuit, vehicles with auxiliary heater
”
,
Electronic parts catalogue
and
Auxiliary/supplementary heater
Rep. gr.
82
Coolant circuit with auxiliary/supplementary heater; Connection diagram - coolant hoses
.
The method of shutting off the heating system heat exchanger from the engine coolant circuit also depends on the engine/gearbox version (with certain versions there is no shut-off, with others shut-off takes place in combination with heating or cooling of the gear oil)
Rep. gr.
19
Cooling system/coolant; Connection diagram - coolant hoses
.
Special tools and workshop equipment required
Hose clamps up to 25 mm
3094
(or commercially available pinch-off tools)
Hose clamp fitting tool
VAS 6340
Hose clip pliers
VAS 6362
Removing
Switch off the ignition.
WARNING
The cooling system is pressurised. When the engine is warm, the coolant temperature may be in excess of 90°C. Dissipate pressure and allow to cool down before performing repairs. Dissipate the pressure in the coolant circuit by opening the cap at the coolant expansion tank
Rep. gr.
19
Cooling system/coolant; Draining and adding coolant
Dissipate the pressure in the coolant circuit by opening the cap on the coolant expansion tank.
Remove the plenum chamber cover
General body repairs, exterior
Rep. gr.
50
Bulkhead; Removing and installing plenum chamber cover
.
Note
The plenum chamber cover must be intact to stop water running into the heater and air conditioning unit via the intake housing with the plenum chamber cover fitted. The plenum chamber cover must also be properly and fully engaged in the windscreen frame
General body repairs, exterior
Rep. gr.
50
Bulkhead; Removing and installing plenum chamber cover
.
Cover the area beneath the connections for the coolant hoses
B, C
to
N82
A
in the plenum chamber with absorbent paper for example.
Note
To stop coolant running into the plenum chamber on detaching the coolant hoses.
Pinch off the coolant hoses
B, C
with hose clamps
3094
(or using commercially available pinch-off tools).
Unfasten the hose clamps
D
and detach the coolant hoses
B, C
.
Unplug the connector
E
.
Remove the nuts
G
and bolts
F
(tightening torque 8 Nm).
Detach the shut-off valve
A
with the holder
D
.
If necessary, remove the combi nuts
J
(tightening torque 8 Nm) and detach the holder
K
.
Installing
Install in reverse order; paying attention to the following:
Note
As only a small quantity of coolant escapes from the coolant circuit on removing
V50
as described above, coolant runs into
N82
following installation and after removing the hose clamps (additionally open the coolant expansion tank cap).
For noise insulation, the shut-off valve
A
is attached by way of the rubber bushes
L
(with mounting bushes and packing plates), the nuts
G
and the bolts
F
to the holder
K
.
Check the rubber bush
L
for correct positioning in the holder
K
.
Bleed the coolant circuit
Chapter
.