Cooling System, Checking For Leaks

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

Special tools and workshop equipment required

Procedure

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 Cooling System TesterV.A.G 1274 B with adapter Cooling System Tester - AdapterVAG1274/8 on the coolant reservoir.

Fig 1: Identifying Cooling System Tester V.A.G 1274 B With Adapter V.A.G 1274/8 Installed On Coolant Expansion Tank

Courtesy of AUDI OF AMERICA, LLC

-- Generate approximately 1 bar pressure using the cooling system tester hand pump.

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

Fig 2: Checking Pressure Relief Valve In Coolant Reservoir Cap

Courtesy of AUDI OF AMERICA, LLC

-- Attach the Cooling System TesterV.A.G 1274 B with Cooling System Tester - AdapterVAG1274/9 to the cap.

-- Generate pressure with cooling system tester hand pump.

-- If pressure relief valve does not open as specified, replace cap.