Coolant, Filling

WARNING: This page is about a different car, the 2022 Audi RS 7 Sportback. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of AUDI OF AMERICA, LLC

Used coolant cannot be used again.
Ignition switched off.

-- Fill the coolant reservoir on the :VAS6096 with 10 liters (2.6 gal) of premixed coolant in the correct mixture ratio. Refer to Coolant Mixture Ratio for the mixture ratio.

-- To make the filling procedure easier, position the coolant reservoir as high up as possible, for example on a workshop cart or the engine and gearbox jack.

-- Install the :VAG1274/8 on the coolant expansion tank -1-.

-- Attach the :VAS6096 on the :VAG1274/8 .

-- Place the drain hose -2- in a small container -3-.

TIP:

A small amount of coolant which should be collected is drawn off with the discharged air.

-- Close the valves -A and B- by turning lever at a right angle to the flow direction.

-- Connect the hose -4- to compressed air.

Pressure: 7 to 10 bar (101.52 to 145.03 psi) positive pressure.

-- Open the valve -B- by turning the lever in the flow direction.

Courtesy of AUDI OF AMERICA, LLC

The suction jet pump generates pressure in the coolant system; indicator on display instrument must move into green area.

-- Briefly open valve -A- by turning the lever in the flow direction so that the coolant reservoir hose on the :VAS6096 fills with coolant.

-- Close the valve -A- again.

-- Leave the valve -B- open another two minutes.

More pressure is generated in the coolant system by the suction jet pump; indicator on display instrument must stay in the green area.

-- Close the valve -B-.

Needle in the display instrument must remain in the green region, then the sufficient vacuum in the cooling system is obtained for the upcoming filling.
Repeat the procedure if the needle goes below the green range.
Check the cooling system for leaks if the pressure drops.

-- Remove the pressure hose.

-- Open the valve -A-.

Coolant is extracted from the :VAS6096 coolant reservoir by pressure in the coolant system and the system is filled.

-- Remove the :VAS6096 from the :VAG1274/8 on the coolant expansion tank.

-- Position the :VAG1274B on the :VAG1274/8 on the coolant expansion tank.

Fig 1: Identifying VAG1274B & VAG1274/8

Courtesy of AUDI OF AMERICA, LLC

Selector level in the "P" position.
Electromechanical parking brake activated.
DTC memory checked.

-- Connect the Vehicle Diagnostic Tester.

-- Select Diagnostic and start.

-- Select Individual tests and select the following tree structures one after the other:

Diagnostic-Capable Systems
0001 - Engine electronics J623
0001 - Engine electronics, functions
0001 - Bleed coolant circuit
Perform the test

-- Start the selected program and follow the instructions on the Vehicle Diagnostic Tester display.

CAUTION:

There is a risk of scalding due to hot steam and hot coolant.

Scalding the skin and other parts of the body is possible.

- Reducing the pressure: press the pressure release valve on the cooling system tester until the pressure gauge displays a value of 0.

-- Remove the :VAG1274B with the :VAG1274/8 from the coolant expansion tank.

-- Close the coolant expansion tank cap until it locks into place.