Cooling System, Checking For Coolant Leaks
Special tools and workshop equipment required
- Cooling System Tester VAG1274B
- Cooling System Tester - Adapter VAG1274/8
- Cooling System Tester - Adapter VAG1274/9
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 the Cooling System Tester VAG1274B with the Cooling System Tester - Adapter VAG1274/8 on the coolant reservoir.
-- 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.
Pressure Relief Valve in Cap, Checking
Fig 2: Connecting Connector Piece VAG 1274 B/1 To Cooling System Tester VAG 1274 B Using Connecting Hose
-- Position the Cooling System Tester VAG1274B with the Cooling System Tester - Adapter VAG1274/9 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.