Filling And Bleeding The Coolant

Special tools and workshop equipment required 

• Cooling System Tester - Adapter:V.A.G 1274/8 
• Cooling System Charge Kit:VAS 6096 

Procedure

-- Remove the cover -1- by pulling toward the rear -arrows-.

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-- Cut the seal loop -3-.

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-- Remove the coolant expansion tank -2- cap -1-.

-- Check if the electrodes -2- from the Engine Coolant Level Sensor -G3237- in the coolant expansion tank are covered with coolant -1-.

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-- If so, extract coolant from the coolant expansion tank using the AdBlue Vacuum Box -VAS 6557A- until the electrodes are free.

Filling and Bleeding the Coolant

-- Perform the "opening electric activated valves of the cooling system for discharging and filling" function using the Vehicle Diagnostic Tester. Refer to the appropriate Service Information .

-- Fill the coolant reservoir of the Cooling System Charge Kit:VAS 6096  with 20 liters of coolant with the proper 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 Cooling System Tester - Adapter:V.A.G 1274/8  on the coolant expansion tank.

-- Assemble the cooling system charge kit on the adapter.

-- Guide the drain hose -2- into 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 the compressed air.

Condition

• Pressure: 7 to 10 bar (101.53 to 145.04 psi) pressure.

-- Open the valve -B- to do so turn the lever in the flow direction.

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Condition

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

-- Additionally, briefly open the valve -A-, to fill the coolant reservoir hose of the cooling system charging kit with coolant.

-- Close the valve -A- again.

-- Open the valve -B- for an additional two minutes.

Condition

• 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-.

Condition

• 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.
• If the vacuum decreases, check the cooling system for leaks.

-- Remove the pressure hose.

-- Open the valve -A-.

Condition

• The vacuum in the cooling system causes the coolant to be extracted from the cooling system charge kit coolant reservoir and the cooling system is being filled.

-- Remove the cooling system charge unit from the coolant reservoir.

-- Fill the coolant up to the lower edge -2- of the cap threads.

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-- Perform the "bleeding the cooling system" function using the Vehicle Diagnostic Tester. Refer to Diagnostic Entries .

Coolant Level, Checking

-- If necessary, fill the coolant to the upper edge of the red marking -1-.

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-- Extract excess coolant.

Attach the seal on the cap of the coolant expansion tank

-- Close the cap -3-.

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-- Then, guide the seal -1- through the holes in the cap -3- and the coolant hose connection -2-.

Condition

• The seal must be applied when the vehicle was previously equipped with a seal.