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 diameter (3094)

• Cooling system tester (V.A.G 1274)

• Adapter for cooling system tester (V.A.G 1274/8)

• Spring-type clip pliers (VAS 6362)

• Drip tray (VAS 6208)

• Torque Wrench (V.A.G 1331)

• Expansion tank (1K0 121 407 A bzw. 6Q0 121 407 A bzw. 1J0 121 407 B)

• Sealing plugs (191 211 343)

• Sealing cap (1J0 121 324)

• Coolant hose (251 265 056)

Test Conditions

• Engine must be cold.

Test Sequence

- Remove insulation pan.

- Clamp off coolant hoses from the oil cooler with hose clamps up to 25 mm diameter (3094).





- Loosen hose clips - arrows - with hose clip pliers (VAS 6362).

• Collect any leaking fluid with the drip tray for VAS 6100 (VAS 6208).

- Disconnect coolant hoses from oil cooler.

- Mount sealing cap - 5 - on the rear connecting piece on the oil cooler - 4 -.





- Secure sealing cap - 2 - on the reservoir vent connection - 1 -.

- Secure coolant hose - 3 - on the oil cooler and on the coolant reservoir.

- Slowly fill coolant up to the upper marking in the hatched area on the expansion tank.





- Position cooling system tester (V.A.G 1274) together with the adapter (V.A.G 1274/8) on the coolant reservoir.

- Generate a pressure of approximately 1.6 bar using the cooling system tester hand pump.

- Watch pressure drop on gauge.

• The pressure must not fall within 10 minutes.

If pressure drops replace oil cooler. Refer to --> [ Oil Filter Bracket and Oil Cooler Assembly Overview ] Service and Repair.

Install in reverse order of removal, noting the following:

- Check coolant level and top off if necessary. Refer to --> [ Cooling System, Draining and Filling ] [1][2]Cooling System, Draining and Filling.