Coolant System, Checking For Leaks

WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, and 2013 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 TesterVAG1274B
Cooling System Tester - AdapterVAG1274/8
Cooling System Tester - AdapterVAG1274//9

Procedure

Fig 1: Identifying MAX-Marking For Coolant

Courtesy of AUDI OF AMERICA, LLC

Engine at operating temperature.

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 the Cooling System TesterVAG1274B with the Cooling System Tester - AdapterVAG1274/8 on the coolant reservoir.

Fig 2: 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 1.0 bar (14.5 psi) pressure using the cooling system tester hand pump.

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

Refer to COOLANT SYSTEM, CHECKING FOR LEAKS .

Fig 3: Checking Pressure Relief Valve In Coolant Reservoir Cap

Courtesy of AUDI OF AMERICA, LLC

-- Position the Cooling System TesterVAG1274B with the Cooling System Tester - AdapterVAG1274/9 on the cap.

-- Generate pressure with cooling system tester hand pump.

The pressure release valve must open at 1.4 to 1.6 bar (20.30 to 23.20 psi).

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