Removing and installing coolant shut-off valve N82 — VW

Removing and installing
coolant shut-off valve
N82
Removing
Special tools and workshop equipment required
Torque wrench
V.A.G 1331
Hose clip pliers
VAS 6362
Hose clamps up to 25 mm
3094
Hose clip pliers
V.A.G 1921
Pliers for spring-type clips
VAS 5024A
Hose clip pliers
VAS 6340
Remove wheel housing liner
General body repairs, exterior
Rep. gr.
66
Wheel housing liner; Front wheel housing liner
.
Undo and remove bolts
4
(8 ± 0.9 Nm) and nuts
2
(6 ± 0.5 Nm).
Pull brackets
1
and
3
together with hoses downwards in
direction of arrow
.
Undo and remove bolt
6
(9 ± 0.5 Nm) and remove clip
1
.
CAUTION
When the engine is warm, the cooling system is under pressure. Danger of scalding due to steam and hot coolant.
There is a risk of injury to the skin and parts of the body due to scalding.
Always wear safety gloves.
Always wear safety goggles.
Proceed as follows to release the pressure: cover the cap of the coolant expansion tank with a cloth, and open it carefully.
Loosen clips
2
and
4
and detach coolant hoses from
coolant shut-off valve
N82
.
Pull
coolant shut-off valve
N82
3
in
direction of arrow
out of holder
5
.
Installing
Installation is carried out in the reverse order. When installing, note the following:
Note
Secure hose connections with hose clips corresponding to the standard version of the equipment
Electronic Parts Catalogue
Make sure that these components do not directly touch the body or any other components.
The direction of coolant flow is marked on the
coolant shut-off valve
N82
.
Ensure that the coolant hoses are correctly arranged at the
coolant shut-off valve
N82
.
Coolant hoses that are mixed up with each other can lead to failure of the heating for the passenger compartment due to coolant flowing in the wrong direction.
Squashed coolant hoses can lead to failure of the heating for the passenger compartment due to the coolant flow being slowed down.
Check coolant level and bleed coolant circuit
Rep. gr.
19
Coolant
.
Function
The
coolant shut-off valve
N82
is controlled by means of the air conditioning controls only if certain settings for the air conditioning system have been made (e.g. in the case of
“OFF”
mode or if maximum cooling is required). In this case, the engine speed must be less than 5000 rpm and the coolant temperature lower than 95 °C.
If the coolant circuit for the heat exchanger of the air conditioning system is closed off, heating of the engine when the coolant is cold is accelerated.
The
coolant shut-off valve
N82
is open unless actuated so that the electrical functioning of the valve can be subjected to a test, which is carried out at certain intervals (e.g. the valve is briefly actuated for approx. 1 second every twentieth time the engine is started).
Integration in the coolant circuit
Coolant shut-off valve
N82
Function of
coolant shut-off valve
N82
Chapter
.
Removing and installing
Chapter
Return flow - from 2nd heat exchanger at rear to engine
Incoming flow - from heat exchanger to 2nd heat exchanger at rear
Return flow - from heat exchanger at front to engine
Incoming flow - from engine to
coolant shut-off valve
N82