Engine Coolant System, Checking For Leaks, High Temperature: Notes

WARNING: This page is about a different car, the 2015 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Cooling System Tester: VAG1274B
Cooling System Tester - Adapter: VAG1274/8
Cooling System Tester - Adapter: VAG1274/9

Procedure:

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 the 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 1: Identifying V.A.G 1274 B With Adapter V.A.G 1274/8

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Generate approximately 1.5 bar (21.75 psi) pressure using the cooling system tester hand pump.

The pressure must not drop more than 0.2 bar (2.9 psi) within 10 minutes.

-- If the pressure falls more than 0.2 bar (2.9 psi), search for leaks and correct the problem.

NOTE:

The pressure decrease of 0.2 bar (2.9 psi) within 10 minutes is a condition of the cooling of the coolant. The colder the engine the more the pressure decrease. If necessary repeat the test with the engine cold.

CAUTION:

Risk of scalding! The existing pressure must be reduced before disconnecting the Cooling System Tester: VAG1274B from the connecting hose or the Adapter: VAG1274B/1 . To do this, press the pressure release valve on the Cooling System Tester: VAG1274B until the pressure gauge displays >>0<<.