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

WARNING: This page is about a different variant/trim than selected.

Special Tools And Workshop Equipment Required

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

Test Conditions

Engine at operating temperature

Test Sequence:

WARNING:

Steam can be released when the cap is removed from the expansion tank. Cover cap with a cloth and open carefully.

-- Open the coolant reservoir cap.

-- Install the Cooling System Tester - Adapter:VAG1274/8 in the coolant expansion tank.

Fig 1: Cooling System Tester V.A.G 1274 Connected To Coolant Reservoir

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Place the Adapter:VAG1274B/1 on the Cooling System Tester - Adapter:VAG1274/8 .

-- Connect the Adapter:VAG1274B/1 to the Cooling System Tester:VAG1274B using the hose provided.

-- Generate approximately 1.5 bar (21.75 psi) pressure with 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<<.