Cooling System: Testing and Inspection

Cooling system, pressure test

^ Engine at operating temperature

WARNING! The cooling system is pressurized when the engine is warm. When opening the expansion tank wear gloves and other appropriate protection, cover the cap with a cloth and open carefully to relieve system pressure slowly.

^ Open cap on coolant expansion tank.





^ Using VAG1274/8 adapter attach VAG1274 cooling system tester to coolant expansion tank.
^ Use tester hand pump to create a pressure of approximately 1.0 bar (14.5 psi).
^ If pressure falls, check for leaks and repair.

Pressure relief valve in cap, checking
^ Attach sealing cap to tester using VAG1274/9 adapter.





^ Install hand pump and pump.
^ Pressure relief valve must open at pressure between 1.4 - 1.6 bar (20.3 - 23.2 psi).