Cooling System, Checking Coolant Concentration

Special tools and workshop equipment required

Cooling System Tester - Directional Valve :VAS 691 005/5
Cooling System Tester :V.A.G 1274B

Tip

The cooling system is checked for unpermitted air pockets. If there is air in the cooling system, the coolant level may drop too far through the running time.

CAUTION:

The cooling system may be under pressure. There is a risk of scalding due to hot steam and hot coolant.

Scalding the skin and other parts of the body is possible.

- Wear safety gloves.

- Wear protective eyewear.

- Reduce the pressure by covering the coolant expansion tank cap with a suitable towel and carefully opening it.

-- Open the coolant reservoir cap -arrow-.

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-- Check the coolant level:

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Condition

Coolant level must be between the MAX mark and approximately 5 mm above the MAX mark

-- Attach the Cooling System Tester - Directional Valve :VAS 691 005/5 -1- to the coolant expansion tank -2-.

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-- Connect the Cooling System Tester :V.A.G 1274B -3- to the adapter -1-.

-- Operate the hand pump several times to create a pressure of 1.5 bar (21.76 psi).

-- Monitor the coolant level in the coolant expansion tank -2-.

If the coolant level in the coolant expansion tank drops more than 30 mm, this means that there is air in the cooling system.

-- Release the pressure at the cooling system tester -3-.

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-- Remove the adapter -1- from the coolant expansion tank -2-.

-- Screw open the coolant expansion tank cap.

Vehicles with Diesel Engine:

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

Continuation for all vehicles

Vehicles with Gasoline Engine, EA211evo:

-- Bleed the cooling system by performing the "filling/bleeding cooling system" function using the Vehicle diagnostic tester . Refer to Diagnostic Entries .

Continuation for all vehicles

Vehicles with Gasoline Engine, EA888:

-- Let the engine run at idle until the radiator fan turns on.

Continuation for all vehicles

-- Repeat the coolant concentration check.

If the coolant level in the coolant expansion tank drops lower than 30 mm. the cooling system is correctly filled.

Continuation

-- Release the pressure at the cooling system tester -3-.

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-- Remove the adapter -1- from the coolant expansion tank -2-.

-- Coolant Level, Checking and Filling:

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Condition

Coolant level must be between the MAX mark and approximately 5 mm above the MAX mark