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HOMESERVICE MANUALSAUDI2009A6 BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 7 (3.0L - COOLING SYSTEM - ENGINE CODE: CCAA)19 COOLING SYSTEMDIAGNOSIS AND TESTINGCOOLING SYSTEM, CHECKING FOR LEAKS
2009 Audi A6 Base

Cooling System, Checking For Leaks

2009 Audi A6 BaseSECTION Cooling System, Checking For Leaks
WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment required 

  • Cooling System Tester VAG1274B
  • Cooling System Tester - Adapter VAG1274/8
  • Cooling System Tester - Adapter VAG1274/9

Checking

  • 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.
  • Cover the coolant reservoir cap with a cloth and then open it slowly to release the pressure in the system.

-- Open the coolant reservoir cap.

-- Position the Cooling System Tester VAG1274B with the Cooling System Tester - Adapter VAG1274/8 on coolant reservoir.

Fig 1: Identifying VAG 1274 B With Adapter VAG 1274/8
GWWA19-10646Courtesy of AUDI OF AMERICA, LLC

-- Generate approximately 1.0 bar (14.5 psi) of pressure using the cooling system tester hand pump.

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

Pressure Relief Valve in Cap, Checking 

Fig 2: Checking Pressure Relief Valve In Coolant Reservoir Cap
GWWA19-10748Courtesy of AUDI OF AMERICA, LLC

-- Attach the Cooling System Tester VAG1274B with the Cooling System Tester - Adapter VAG1274/9 to sealing 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.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.