Oil Cooler: Testing and Inspection

Oil Cooler, Checking for Leaks

Special tools, testers and auxiliary items required

• Refractometer (T10007)

• Hose Clamps Up to 25 mm Dia. (3094)

• Cooling System Tester (V.A.G 1274)

• Adapter (V.A.G 1274/8)

• Hose Clip Pliers (VAS 6340)

• Drip Tray for VAS 6100 (VAS 6208)

• Torque Wrench (5-50 Nm) (V.A.G 1331)

Conditions

• The engine is cold.

Sequence

- Remove the noise insulation.

- Clamp off the supply and return hoses to the oil cooler using the hose clamps up to 25 mm dia. (VAS 3094).






- Reposition the clamps - arrows - using the hose clip pliers (VAS 6340).

• Catch any coolant running out with the drip tray (V.A.G 1306) or the drip tray for VAS 6100 (VAS 6208).

- Disconnect the coolant hoses from the oil cooler.

- Install the cap - 5 - onto the rear connection of the oil cooler - 4 -.






- Install the cap - 2 - on the expansion tank vent - 1 -.

- Attach the coolant hose - 3 - to the oil cooler and to the expansion tank.

- Fill the expansion tank up to the "MAX" mark.

- Install the cooling system tester (V.A.G 1274) with the adapter (V.A.G 1274/8) onto the expansion tank.

- Build a pressure of approximately 1.4 bar using the tester hand pump.

- Watch the pressure decrease on the pressure tester gauge. The pressure must not fall within 10 minutes.

If the pressure drops:

- Replace the oil cooler. Refer to => [ Oil Filter Adapter and Engine Oil Cooler Overview ] Oil Filter Adapter and Engine Oil Cooler Overview.

Further installation is in the reverse order of removal. Note the following:

- Check the coolant level, fill if necessary. Refer to => [ Coolant, Draining and Filling ] Procedures.