Cooling system, draining and filling: Filling

WARNING: This page is about a different car, the 2006 Audi A8, 2005 Audi A8, and 2004 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The cooling system is filled all year round with a mixture of frost and corrosion protection additives and water.
Use only coolant additive Plus G 012 A8F A1 (short: G12+) "according to TL VW 774 F". Other coolant additives may above all reduce the corrosion protection effect significantly. The damage resulting from this may lead to loss of coolant and consequently to severe engine damage.
Coolant additive G12+ can be combined with additives G11 and G12.
G12+ and coolant additives with the designation "according to TL VW 774 F" reduce frost and corrosion damage as well as lime deposits. They also raise the boiling point. For this reason the system must be filled all year round with frost and corrosion protection additives.
Because of its high boiling point, the coolant improves engine reliability under heavy loads, particularly in countries with tropical climates.
Protection against frost must be assured to about -25°C (in arctic climatic countries to about -35°C).
The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The coolant additive portion must be at least 40%.
If for climatic reasons greater frost protection is required, the amount of G12+ can be increased, but only up to 60% (frost protection to about -40°C), otherwise frost protection and cooling effectiveness will be reduced.
Only clean drinking water may be used for mixing coolant.
If the radiator, heater core, cylinder head and cylinder head gasket or cylinder block is replaced, completely replace the engine coolant.
Dirty coolant must not be re-used.
For coolant G12+ , use refractometer T10007 to test frost protection in cooling system.
Replace seal.
Secure all hose connections using hose clamps appropriate for the model type .

Fig 1: Identifying Coolant Hose & Drain Plug

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Connect coolant hose - 1 -.
Install drain plug - 2 - at oil filter bracket with new gasket in engine at right.

Fig 2: Installing Drain Plug At Oil Filter Bracket With New Gasket In Engine At Left

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Install drain plug - 2 - at oil filter bracket with new gasket in engine at left.

Component		Nm
Drain plug to	Oil filter bracket	10
	Drain pipe	18

Fig 3: Filling Replacement Reservoir VAS 6096/1 With At Least 14 Liters Of Pre-Mixed Coolant With Correct Mixture Ratio

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Fill replacement reservoir VAS 6096/1 with at least 14 liters of pre-mixed coolant with correct mixture ratio:

G12+ (40%) and water (60%) for frost protection up to -25°C
G12+ (50%) and water (50%) for frost protection up to -35°C
G12+ (60%) and water (40%) for frost protection up to -40°C

Install adapter V.A.G 1274/8 on expansion tank.
Assemble cooling system charge unit VAS 6096 on adapter V.A.G 1274/8.
Place air outlet hose - 1 - into a small container - 2 -.

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

Close both valves - A - and - B - (lever perpendicular to direction of flow).
Connect hose - 3 - to pressurized air.

Pressure: 6 to 10 bar positive pressure

Fig 4: Identifying VAS 6096/1 & VAS 6096 Valves

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Open valve - B - (lever in direction of flow).

A vacuum is created in cooling system by suction jet pump.
Needle on instrument display must travel into green region.

Also, open valve briefly - A - (lever in direction of flow) so that hose of cooling system charge unit VAS 6096/1 is filled with coolant.
Close valve - A - again.
Let valve - B - remain open another 2 minutes.

A further vacuum is created in cooling system by suction jet pump.
Needle on instrument display must still remain in green region.

Close valve - B -.

Needle in display instrument must remain in green region, then sufficient vacuum in cooling system is obtained for upcoming filling.
If needle stands below green region, repeat procedure.
If vacuum decreases, cooling system is leaking.

Disconnect pressurized air hose.
Open valve - A -.

The vacuum in cooling system has effect of extracting coolant from replacement reservoir VAS 6096/1 so that cooling system is filled.

Detach cooling system charge unit VAS 6096 from coolant expansion tank.

Fig 5: Connecting Adapter For VAG1274 Tester V.A.G 1274/10 To Adapter V.A.G 1274/8.

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Connect adapter for VAG1274 tester V.A.G 1274/10 to adapter V.A.G 1274/8.

Fig 6: Identifying Rubber Seal & Plenum Chamber Cover

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Remove rubber seal - 1 - for plenum chamber cover.
Remove plenum chamber cover - 2 -.

Fig 7: Identifying Bleeder Screws

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Open bleeder screws - 1 - and - 2 -.
Fill up coolant until it escapes at bleeder screws - 1 - and - 2 - without bubbles.
Close bleeder screws.
Close expansion tank.

If present, switch on auxiliary heater for about 30 seconds.
Set interior temperature to "HI".
Let engine run at 2000 RPM for 3 minutes.
Let engine run at idle long enough until both large coolant hoses on main cooler are warm.

Let engine run at 2000 RPM for 1 minute.
Turn off engine and allow it to cool off.

Fig 8: Checking Coolant Level

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Check coolant level.

With cold engine, coolant level must be at MAX marking.
Coolant level may be above MAX marking with engine at operating temperature.