3.6L - Cooling System - Engine Code(s): Blv: Maintenance Volkswagen Passat B6

DRAINING AND FILLING

Special tools and workshop equipment required

1. Refractometer T10007
2. Drip Tray for VAS 6100 VAS 6208
3. Hose Clip Pliers VAS 6362
4. Cooling System Charge Unit VAS 6096
5. Adapter V.A.G 1274/8

Draining

Note. Drained coolant must be stored in a clean container for disposal or reuse. Follow disposal regulations.

Carefully open the coolant expansion tank cap.

Remove the noise insulation. Refer to Description and Operation .

Disengage the quick acting coupling -arrow- and disconnect the coolant hose from the bottom of the radiator.

Scheme 31

Also remove the lower coolant hose from the after-run coolant pump -V51- -arrow- and allow any remaining coolant to drain.

Scheme 32

Note. Observe disposal regulations for coolant!

Filling

Note. On vehicles from MY 2008, only coolant additive G 12 plus-plus conforming to TL VW 774 G may be used. On vehicles through MY 2007, coolant additive G 12 plus conforming to TL VW 774 F and G 12 plus-plus conforming to TL VW 774 G can be used. G 12 plus-plus may be mixed with the previous coolant additive G12 plus. Both are colored purple. Coolant additives marked with "Conforms to TL VW 774 G" or "Conforms to TL VW 774 F" prevent freezing and corrosion damage and scaling and they increase the boiling point. The cooling system must be filled with coolant additive year-round. Because of its high boiling point, the coolant improves engine reliability under heavy loads, particularly in countries with tropical climates. Freeze protection down to approximately -25°C (-13°F) must be guaranteed. Freeze protection down to approximately -35°C (-31°F) must be guaranteed in countries with cold climates. The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The coolant additive portion must be at least 40%. If a lower freeze protection is necessary due to the climatic conditions, increase the amount of coolant additive. The maximum amount is 60%, which provides freeze protection down to approximately -40°C (-40°F). If the amount is increased beyond that, the freeze protection will be reduced and cooling effect will be reduced. The refractometer T10007 is recommended for determining freeze protection density. If the radiator, heater core, cylinder head or cylinder head gasket is replaced, do not reuse the old coolant.

Recommended Mixture Ratios

Procedure

Connect the coolant hose -arrow- to the after-run coolant pump again.

Slide the coolant hose to the bottom of the radiator and secure it.

Install the noise insulation. Refer to Description and Operation .

Install the adapter V.A.G 1274/8 onto the expansion tank.

Fill the coolant circuit using the cooling system charge unit VAS 6096. Refer to the operating instructions for cooling system filler unit VAS 6096.

Check the coolant level and fill if necessary. With the engine at the operating temperature, the coolant level must be at the top mark, with the engine cold, it must be in the center of the hatched area.

Scheme 33

Scheme 34

1. Expansion Tank
2. Heater Core Replace the coolant after replacing.
3. Coolant Pipe, Side, Top
4. Transmission Oil Cooler
5. Non-Return Valve Note the installed position. Arrow on the check valve points in the direction of flow.
6. Auxiliary Cooler
7. Upper Coolant Hose
8. Lower Coolant Hose
9. Radiator
10. Coolant Pipe, Side, Bottom
11. Non-Return Valve Note the Installed position Arrow on the check valve points in the direction of flow.
12. Oil Cooler For the engine oil
13. Recirculation Pump -V55
14. Coolant Line With the coolant thermostat housing.
15. Coolant Pump
16. Coolant Thermostat
17. Cylinder Block
18. Rear Coolant Pipe