Bleed Cooling System.

WARNING: This page is about a different car, the 2024 Audi Q7 and 2023 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Procedure

Fig 1: Coolant Expansion Tank

Courtesy of AUDI

-- Tighten the cap -1- on the coolant expansion tank until it locks into place.

-- Start the engine.

Duration	Engine speed	Requirement
Three minutes	2000 RPM	A/C system "OFF", the LED in the AC button does not turn on Heater on "HI", blower speed as low as possible (= 0)
Until both large coolant hoses on the radiator are warm	Idle	A/C system "OFF" Heater "HI"
2 Minutes	2000 RPM	A/C system "OFF" Heater "HI"

-- Turn off the engine.

-- Install the noise insulation. Refer to OVERVIEW - NOISE INSULATION .

Continuation of the filling procedure:

-- Check the coolant level and fill with coolant. Refer to COOLANT LEVEL, CHECKING AND FILLING .