Cooling System, Filling With Distilled Water

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-- Place the drain hose -8- from the suction jet pump in a container.

-- Connect the pressure hose -6- on the suction jet pump -7-.

-- Open the shut-off valve -B- on the valve block -5-.

• A further vacuum is created in the cooling system by the suction jet pump. The needle on the pressure gauge must lower to a minimum - 0.85 bar (12.3 PSI).

-- Close the shut-off valve -B-.

-- Remove the pressure hose -6-.

-- Watch the pressure gauge. The needle on the pressure gauge must stay at a minimum - 0.85 bar (12.3 PSI). Only then is there enough vacuum in the coolant system for the filling.

TIP: 

• Check the cooling system for leaks if the pressure drops.
• The vacuum required depends on the pressure in the pressure air system.

• The pump for the :VAS531007  must be switched on.

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-- >>Slowly<< open the shut-off valve -A-.

• The distilled water is extracted and the cooling system is filled via the vacuum in the cooling system. The pump for the :VAS531007  also moves the distilled water into the coolant expansion tank.
• After filling, the coolant expansion tank must be depressurized. Proceed as follows:

-- Close after filling the shut-off valve -A-.

-- Remove the suction jet pump -2- from the valve block -1-.

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-- Connect the drain hose -arrow- to the connector coupling. Open the shut-off valve -B- and leave it open, so that the pressure in the cooling system reduces.

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Cooling System, Flushing With Distilled Water 

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-- Remove the bleeder hose -2- from the coolant expansion tank -1-.

-- Connect the bleeder hose -2- from the coolant expansion tank with the flushing hose -1-.

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-- Seal the connection on the coolant expansion tank using the plugs -3-. Secure the plug with a hose clamp.

-- Close the shut-off valve -B-.

-- Remove the engine cover.

Vehicles With Camshaft Adjustment: 

-- Remove the air filter housing. Refer to AIR FILTER HOUSING, REMOVING AND INSTALLING .

Continuation For All Vehicles: 

The cooling system is divided into the following coolant circuits:

• Cylinder block and cylinder head
• Heater Core for the Heater
• Radiator
• Charge air cooler and charge air cooling circuit cooler

TIP: 

• The goal in the following procedure is to flush the four coolant circuits by clamping the bleeder hoses while alternating from side to side.
• This procedure must be done twice with distilled water. Then it is flushed twice with coolant.
• The liter specifications are averages and may differ depending on the vehicle equipment. The quantity can be read using the scale on the container.
• Important for the flushing quantity is the change in color at connection 1 in the sight window. Likeness in color between connection 1 and 2 in the sight window is only achieved during the second flushing procedure.
• If a change in color is visible in the viewing glass, the next coolant circuit is flushed.