Coolant System, Checking For Leaks: Notes

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Special tools and workshop equipment required

Cooling System Tester VAG1274B
Cooling System Tester - Adapter VAG1274/8
Cooling System Tester - Adapter VAG 1274/9

Procedure

Fig 1: Identifying Coolant Reservoir Marking

Courtesy of AUDI OF AMERICA, LLC

Engine at operating temperature.

WARNING:

Risk of scalding due to hot steam and hot coolant.

The coolant system is under pressure when the engine is warm.
Reduce pressure by covering coolant reservoir cap with a cloth and carefully opening.

-- Open the coolant reservoir cap.

-- Position the Cooling System Tester VAG1274B with the Cooling System Tester - Adapter VAG1274/8 on the coolant reservoir.

Fig 2: Identifying VAG 1274 B & VAG 1274/8

Courtesy of AUDI OF AMERICA, LLC

-- Generate approximately 1.0 bar (14.5 psi) pressure using the cooling system tester hand pump.

-- If pressure falls, search for leaks and correct problem.