Cooling System, Checking For Leaks
WARNING: This page is about a different car, the 2011 Audi Q7, 2010 Audi Q7, and 2009 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
- Cooling System Tester - AdapterVAG1274/8
- Cooling System Tester - AdapterVAG1274/9
Procedure
- 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 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
-- Generate approximately 1 bar pressure using the cooling system tester hand pump.
-- If pressure falls, search for leaks and correct problem.
-- 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.
- The pressure release valve must open at 1.4 to 1.6 bar.
-- If pressure relief valve does not open as specified, replace cap.