Coolant Mixture Ratio

WARNING: This page is about a different car, the 2022 Audi A6 Quattro and 2021 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

There is a risk of corrosion damage from an unsuitable mixture of water and coolant additive.

- For optimal corrosion protection distilled water must be used.

Coolant (40%) and distilled water (60%) for freeze protection down to -25 °C (-13 °F)
Coolant (50%) and distilled water (50%) for freeze protection down to -36 °C (-32.8 °F)
Coolant. Refer to the Parts Information.

Procedure

Used coolant cannot be used again.

-- Fill with coolant reservoir from the : VAS6096 with 10 liters (2.6 gallons) of coolant with 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-.

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-- 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 coolant circuit valves. Refer to Vehicle Diagnostic Tester 0001 - Engine Electronics Functions , 0001 - Coolant Circuit Bleeding Procedure .

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

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

-- Briefly open the valve -A- by turning the lever in the flow direction so that the hose on the : VAS6096 coolant reservoir 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 and the : VAG1274/8 from the coolant expansion tank.

Continuation of the Filling Procedure:

-- Bleed the cooling system. Refer to BLEED COOLING SYSTEM .