Audi A4: Coolant temperature display
Audi A4 (B9) 2016-2025 Owner's Manual / Display and operation / Instrument cluster / Coolant temperature display
Applies to: vehicles with a coolant temperature indicator
The coolant temperature display (9) only functions when the ignition is switched on.
To reduce the risk of engine damage, please observe the following notes about the temperature ranges.
Cold range
If only the LEDs at the bottom of the gauge turn on, the engine has not reached operating temperature yet. Avoid high engine speeds, full acceleration, and heavy engine loads.
Normal range
The engine has reached its operating temperature
once the LEDs up to the center of the gauge
turn on. If the .png)
indicator light in
the instrument cluster display turns on, the coolant temperature
is too high.
Note
- Auxiliary headlights and other accessories in front of the air intake impair the cooling effect of the coolant. This increases the risk of the engine overheating during high outside temperatures and heavy engine load.
- The front spoiler also helps to distribute cooling air correctly while driving. If the spoiler is damaged, the cooling effect will be impaired and the risk of the engine overheating will increase. See an authorized Audi dealer or authorized Audi Service Facility for assistance.
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Tachometer
The tachometer (1) displays the engine
speed in revolutions per minute (RPM). The beginning
of the red zone in the tachometer indicates
the maximum permissible engine speed for
all gears once the engi
General touch display operation
General information
Applies to: touch display
The center display is a touchscreen. Operation is
very similar to operating a smartphone.
Tips
Certain gestures are not available in every
menu.
Pressing
SEE MORE:
Refrigerant R134a
Refrigerant R134a Physical Data
Vehicle air conditioning systems make use of the
vaporization and condensation process. In this case, one works
with a substance which boils easily, designated as refrigerant.
The refrigerant used is tetrafluoroethane R134a, which boils
at -26.5 ºC (-15.7 ºF) at
Finding Leaks via Vacuum Test using A/C Service Station or Nitrogen
Pressure Testing
Vehicles with a High Voltage System (Hybrid Vehicles)
Read and follow all of the supplemental warnings for all
work performed on vehicles with the high voltage system. Refer
to
→ Chapter "Warnings when Working on Vehicles with High Voltage
System" and
→ Electrical Equipment;
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