Removing and installing heater coolant shut-off valve N279 (all models except Audi S6) — AUDI
Removing and installing heater coolant shut-off valve N279 (all models except Audi S6) on Audi: factory workshop procedure.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
Removing and installing
heater coolant shut-off valve
N279
(all models except Audi S6)
Removing
Note
Removal of
heater coolant shutoff valve
N279
for a vehicle with 3.0 l MPI engine is described below. Proceed analogously for all other engine versions.
On removal, note down bolt lengths and assignment for re-installation.
All cable ties and other wiring harness fasteners which are released or cut open during removal of
heater coolant shutoff valve
N279
are to refitted in same position on installation.
Switch off ignition (and auxiliary heater).
Detach rear engine cover
arrows
.
Drain coolant
Engine, Mechanical Components
Rep. Gr.
19
.
Detach coolant hose
2
.
Unbolt coolant expansion tank
arrow
.
Detach electrical connector from
coolant shortage indicator switch
F66
at bottom of expansion tank and lay coolant expansion tank with connected coolant hoses
1
and
3
to one side.
Remove bolt
A
and lay power steering reservoir with connected coolant hydraulic hoses to one side.
Detach coolant hoses from points marked with
arrows
; use
pliers for spring clips
VAS 5024 A
to open spring clips.
Unplug electrical connector
B
at
heater coolant shutoff valve
N279
.
Remove out bolts
A
and
C
.
Remove
heater coolant shutoff valve
N279
from vehicle and detach coolant hose
arrow
.
Installing
Installation is in reverse order; pay attention to the following:
After installing, check the exhaust pipe, the coolant hoses, fuel pipe and wiring to the auxiliary heater; they must not touch any other components.
After installing noise insulation, check position of exhaust pipe
A
; a gasket
B
must be installed between exhaust pipe
A
and noise insulation. Exhaust pipe must protrude downwards out of gasket and outlet of exhaust gas from exhaust pipe
A
must not be impeded
Note
Secure all hose connections with standard clamps
Electronic parts catalogue
.
Fill coolant
Engine, Mechanical Components
Rep. Gr.
19
.
Bleed coolant circuit
Chapter
and
Engine, Mechanical Components
Rep. Gr.
19
.
Tightening torques
Component
Nm
Heater coolant shutoff valve
N279
to body
7
Power steering reservoir to body
9
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.