Coolant shutoff valve N82 function — AUDI

Coolant shutoff valve
N82
function
Note
The fitting location, designation and version of
N82
A
depend on the vehicle model and equipment; note correct allocation
Electronic parts catalogue
.
At present, the
N82
A
is only fitted on vehicles with certain engines (currently not fitted for example on vehicles with an 8-cyl. TDI engine)
Rep. gr.
19
Cooling system/coolant; Connection diagram - coolant hoses
. If vehicles with these engines are equipped with an auxiliary heater as optional extra, no shutoff valve is fitted (this function is assumed by the
heater coolant shutoff valve
N279
fitted on vehicles with auxiliary heater
Chapter
“
Heater coolant shut-off valve
N279
function
”
). It is therefore important to ensure the correct encoding of the air conditioner front operating and display unit (
Climatronic control unit
J255
)
Vehicle diagnostic tester
in
“Guided Fault Finding”
mode.
To reduce noise, the retainer
E
for
V50
and for
N82
A
is not bolted directly to the body. It is attached by way of bolts and rubber elements. Make sure these components do not make direct contact with the body or come into contact with other components.
The air conditioner regulation system only activates
N82
A
in certain air conditioner settings (e.g. in
“OFF”
mode or if maximum cooling output is required). In this case, the engine speed must be smaller than 5000 rpm, and the coolant temperature must be below 90 °C (Centigrade). If the coolant circuit to the heat exchangers of the air conditioning system is shut off, the engine will heat up more quickly when the coolant is cold.
When it is not activated, the
N82
A
is open; to allow the electrical function of the valve to be checked, it is activated for short period of time at certain intervals (e.g. for 1 second every twentieth engine start).
Depending on the model and the engine, the vehicle may additionally be fitted with a non-return valve in the coolant circuit. A certain amount of coolant in the small circuit flows back to the engine via this non-return valve even when the
coolant shut-off valve
N82
A
/
heater coolant shut-off valve
N279
is activated
Rep. gr.
19
Cooling system/coolant; Connection diagram - coolant hoses
.
N82
is currently not fitted in vehicles with an engine with regulated coolant circuit (certain vehicles from model year 2010 onwards, e.g. with a regulated coolant pump and a
coolant valve for cylinder head
N489
). On engines with a regulated coolant pump, the engine control unit activates the coolant pump to regulate coolant circulation
Rep. gr.
19
Cooling system/coolant; Connection diagram - coolant hoses
.
Removing and installing
coolant shut-off valve
N82
Chapter
“
Removing and installing
coolant shut-off valve
N82
”
Removing and installing bracket
E
for
coolant circulation pump
V50
and
coolant shut-off valve
N82
/
heater coolant shut-off valve
N279
Chapter
“
Heater coolant shut-off valve
N279
function
”