Audi A4 2023 Owner's Manual page 233

Checking and Filling
The amount of coolant additive that needs to be
mixed with water depends on the climate where
the vehicle will be operated. If the coolant addi-
tive percentage is too low, the coolant can freeze
and damage the engine.
Warm min. -13 °F
regions (25°C)
Cold max. -40 °F
regions (-40 °C)
— Before the start of winter, have an author-
ized Audi dealer or authorized Audi Service
Facility check if the coolant additive in your
vehicle matches the percentage appropriate
for the climate. This is especially important
when driving in colder climates.
~ If the G1 2evo coolant additive is not availa-
ble in an emergency, do not add any other
additive. You could damage the engine. If
this happens, only use distilled water and
restore the correct mixture ratio with the
specified coolant additive as soon as possi-
ble.
— Only refill with new coolant.
— Radiator sealant must not be mixed with
the coolant.
— You can continue driving if the permitted
G12evo coolant additive was not added.
However, go to an authorized Audi dealer or
authorized Audi Service Facility immediately
to have the coolant replaced to reduce the
risk of engine damage.
— Due to the risk of engine damage, the cool-
ing system should only be refilled by an au-
thorized Audi dealer or authorized Audi
Service Facility. An authorized Audi dealer or
authorized Audi Service Facility can also pro-
vide you with important information about
the recommended coolant additive.
ecking coolant
Fig. 160 Engine compartment - Coolant expansion tank
(diagram): @ cover with release button; @ markings
Observe the safety precautions page 223, Gen-
eral information.
Checking the coolant level
» Park the vehicle on a level surface.
» Switch the ignition off.
» Open the hood page 225.
The coolant expansion tank for some engines is
located in the water drip tray under a cover. If
necessary, remove the cover that is located under
the windshield wiper on the front passenger's
side.
» Check the coolant level in the coolant expan-
sion tank © page 226, fig. 157 using the outer
markings @) © fig. 160. The coolant level must
be between the markings @) when the engine is
cold. When the engine is warm it can be slight
ly above the upper marking.
> Applies to: vehicles with 6-cylinder engine:
There is a float located in the coolant expansion
tank. Read the coolant level using the coolant
level float. When the engine is cold, the float.
must be located between the MIN marking and
the edge of the filler opening on the coolant ex-
pansion tank.
» When you add coolant to the expansion tank,
please refer to > page 230, Cooling system.
Adding coolant
Requirement: there must be a residual amount of
coolant in the expansion tank >@.
Ifyou must add coolant, use a mixture of water
and coolant additive. Audi recommends mixing
the coolant additive with distilled water. >
231