Cooling system, draining and filling: Filling

WARNING: This page is about a different car, the 2008 Audi RS 4 and 2007 Audi RS 4. 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.

Fig 1: Removing Drain Plug On Coolant Thermostat Housing

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Reinstall drain plug - arrow - with new O-ring at coolant thermostat housing.

Fig 2: Removing Drain Plug On Front Coolant Pipe

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Reinstall drain plug - arrow - with new gasket at front coolant pipe.

Fig 3: Filling Reservoir VAS 6096/1 With At Least 12 Liters Of Premixed Coolant

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Fill coolant reservoir of Cooling System Charge Unit VAS 6096 with at least 12 liters of premixed 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 onto 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 which should be reserved with discharged air.)
Close both valves - A - and - B - by turning lever perpendicular to direction of flow.

Connect hose - 3 - to pressurized air.

Pressure: 6 to 10 bar positive pressure.

Fig 4: Cooling System, Draining And Filling

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Open valve - B - , turn lever in direction of flow to do this.

A vacuum is created in cooling system by the suction jet pump.

Needle on instrument display must travel into green region.

Also briefly open valve - A - , turn lever in direction of flow to do this, so that coolant reservoir hose of cooling system filler unit VAS 6096 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 the 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 the effect of extracting coolant from coolant reservoir VAS 6096/1 ; cooling system is filled.

Detach cooling system filler unit VAS 6096 from adapter V.A.G 1274/8 on coolant expansion tank.

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

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Connect pipe for cooling system tester V.A.G 1274/10 to adapter.

Fig 6: Identifying Plenum Chamber Cover & Rubber Seal

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Remove rubber seal and remove plenum chamber cover - 1 - forward - arrows -.

Fig 7: Sliding Back Boot For Coolant Hoses At Connection Of Heater Core

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Slide back boot for coolant hoses at connection of heater core.
Loosen coolant hose to heater core and pull back hose sufficiently so that the bleeder hole - arrow - is no longer sealed by connection.
Fill up coolant until it escapes from coolant hose bleeder hole without bubbles.
Push coolant hose back onto connection and secure it with hose clamp.

Twist expansion tank cap closed.
Start engine.
Set heating air conditioning system 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.

Torque specifications

Component	Nm
Drain plug to coolant regulator housing	4
Drain plug to front coolant pipe	10