Cooling System, Checking For Leaks: Notes

Special tools and workshop equipment required 

• Cooling System Tester:V.A.G 1274B 

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• Cooling System Tester - Adapter:V.A.G 1274/8 

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• Cooling System Tester - Adapter:V.A.G 1274/9 

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Procedure

• To perform the leak test correctly, a check (self-test) of the Cooling System Tester :V.A.G 1274 B  must be performed first.

Check (self-test) Cooling System Tester:V.A.G 1274B 

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-- Operate the Cooling System Tester:V.A.G 1274 B  multiple times.

-- Create a pressure of 3.0 bar (43.51 psi) on the cooling system tester.

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-- Pay attention to the pressure on the pressure gauge of the Cooling System Tester :V.A.G 1274 B  for 30 seconds.

If pressure is not built up or if the pressure falls again:

• The Cooling System Tester:V.A.G 1274 B  is leaking and must not be used.

Cooling System, Checking for Leaks

• Engine at operating temperature.
• Ignition switched off.

-- Open the coolant reservoir cap -arrow-.

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-- Position the Cooling System Tester:V.A.G 1274B  with the Cooling System Tester - Adapter :V.A.G 1274/8  on the coolant expansion tank.

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-- Generate approximately 1.5 bar (21.76 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.
• 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.

If the pressure falls more than 0.2 bar:

-- Check the engine and radiator for leaks and correct.