Cooling System, Checking For Leaks

WARNING: This page is about a different car, the 2010 Audi Q7, 2009 Audi Q7, 2008 Audi Q7, and 2007 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Cooling System TesterV.A.G 1274 B
AdapterV.A.G 1274/8
AdapterV.A.G 1274/9

Procedure

Engine at operating temperature.

WARNING:

Risk of scalding due to hot steam and hot coolant.

When the engine is warm the cooling system is under pressure.
To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

-- Position the V.A.G 1274 B with the V.A.G 1274/8 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 a positive pressure of approximately 1.0 bar using hand pump of cooling system tester.

If the pressure drops:

-- Search for leaking areas and repair the malfunction.

Refer to COOLING SYSTEM, CHECKING FOR LEAKS .

Fig 2: Checking Pressure Relief Valve In Coolant Reservoir Cap

Courtesy of AUDI OF AMERICA, LLC

-- Attach V.A.G 1274 B with V.A.G 1274/9 to sealing cap.

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

The pressure release valve must open at 1.4 to 1.6 bar (20.30 to psi).

If check-valve does not open as indicated:

-- Replace cap.