Cooling System, Checking For Coolant Leaks

WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Cooling System Tester V.A.G 1274
Adapter V.A.G 1274/8
Adapter V.A.G 1274/9

Test Conditions

Engine at operating temperature.

Test Sequence

WARNING:

Cover cap of expansion tank with a rag and open carefully, as hot steam or hot coolant may escape when opening.

-- Open cap of coolant expansion tank.

-- Attach the V.A.G 1274 with the V.A.G 1274/8 to expansion tank.

Fig 1: Attaching VAG1274 Cooling System Tester Together With VAG1274/8 Adapter To Coolant Expansion Tank

Courtesy of AUDI OF AMERICA, LLC

-- Generate a positive pressure of approximately 1.0 bar using hand pump of cooling system tester.

-- If pressure decreases, search for leaking areas and repair the malfunction.

Pressure Relief Valve in Cap, Checking

-- Attach the V.A.G 1274 with V.A.G 1274/9 to expansion tank cap.

Fig 2: Attaching Cooling System Tester V.A.G 1274 With Adapter V.A.G 1274/9 On Sealing Cap

Courtesy of AUDI OF AMERICA, LLC

-- Operate hand pump.

The pressure release valve must open at 1.4 to 1.6 bar