Draining and Filling, Low Temperature Coolant Circuit
Draining and Filling, Low Temperature Coolant Circuit
Risk of scalding due to hot steam and hot coolant.
• The coolant system is under pressure when the engine is warm.
• Cover the coolant expansion tank cap with a cloth and then open it slowly to release the pressure in the system.
Special tools, testers and auxiliary items required
• Adapter (V.A.G 1274/8)
• Adapter for VAG 1274 Tester (V.A.G 1274/10)
• Cooling System Charge Unit (VAS 6096)
• Drip Tray for VAS 6100 (VAS 6208)
• Hose Clip Pliers (VAS 6362)
• Refractometer (T10007)
Draining
• Drained coolant must be stored in a clean container for disposal or reuse.
Risk of scalding due to hot steam and hot coolant.
• The coolant system is under pressure when the engine is warm.
• Cover the coolant expansion tank cap with a cloth and then open it slowly to release the pressure in the system.
- Open the coolant expansion tank cap.
- Remove the noise insulation.
- Remove the coolant hoses - arrows - and drain the coolant.
Filling
Requirement:
• Ignition is turned off.
Do not mix distilled water with coolant additives. Using distilled water provides optimum corrosion protection.
• The water portion of the coolant influences the effectiveness of the coolant. Volkswagen has decided to define the water quality used in the cooling system based on the different mixtures and country and regional requirements. Use distilled water.
• Use only coolant additives listed in the Parts Catalog. Other coolant additives may above all reduce the corrosion protection effect significantly. The damage resulting from this may lead to loss of coolant and consequently to severe engine damage.
• Coolant with the correct mixture ratio prevents freezing and corrosion damage and calcium deposits. The boiling point will be raised. 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 must be guaranteed down to approximately -25 °C (-13 °F) (in arctic climatic countries down to approximately -35 °C (-31 °F)).
• 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. Only up to 60% (freeze protection down to approximately -40 °C (-40 °F)). Otherwise the freeze protection and cooling effect are reduced.
• Do not use the old coolant again if replacing the radiator, heater core, cylinder head or cylinder head gasket.
• The refractometer (T10007 A) is recommended for determining freeze protection density.
- Install the coolant hoses - arrows -.
- Fill the coolant reservoir on the cooling system charge unit (VAS 6096) with at least 5 liters of premixed coolant with the proper mixture ratio:
• Coolant additive (40%) and distilled water (60%) for freeze protection down to -25 °C (-13 °F).
• Coolant additive (50%) and distilled water (50%) for freeze protection down to -35 °C (-31 °F).
• Coolant additive (60%) and distilled water (40%) for freeze protection down to -40 °C (-40 °F).
• For the correct coolant additive, refer to the Parts Catalog.
- Install the adapter (V.A.G 1274/8) onto the coolant expansion tank.
- Install the cooling system charge unit (VAS 6096) onto the adapter (V.A.G 1274/8).
- Close the levers - A and B - by turning the them at a right angle to the direction of flow.
- Place the hose - 1 - in a small container - 2 -.
• A small amount of coolant which should be collected is drawn off with the discharged air.
- Connect the hose - 3 - to compressed air.
• Pressure: 6 to 10 bar pressure.
- Open the lever - B - by turning it in the direction of flow.
• A further vacuum is created in the cooling system by the suction jet pump. The needle on the instrument display must travel into the green region.
- Briefly open the lever - A - by turning it in the direction of flow so that the hose on the cooling system charge unit coolant reservoir fills with coolant.
- Close the lever - A - again.
- Leave the lever - B - open another 2 minutes.
• A further vacuum is created in the cooling system by the suction jet pump. The needle on the instrument display must still remain in the green region.
- Close the lever - B -.
• The needle on display must remain in the green range. Only then is there enough vacuum in the coolant system for the filling.
• Repeat the procedure if the needle goes below the green range.
• If pressure falls, check coolant system for leaks.
- Remove the pressurized air hose.
- Open the lever - A - slowly.
• Coolant is extracted from the cooling system charge unit coolant reservoir by pressure in the coolant system and the system is filled.
- Remove the cooling system charge unit (VAS 6096) from the adapter (V.A.G 1274/8) on the coolant expansion tank.
- Install the adapter for VAG 1274 tester (V.A.G 1274/10) onto the adapter (V.A.G 1274/8).
- Fill the coolant until the adapter for VAG 1274 tester (V.A.G 1274/10) is full. Fill again during the bleeding procedure if necessary.
- Remove the engine covers - 1 and 2 - upward.
• Place a cloth under the bleed valve to catch any leaking coolant.
- Open the valve - arrow - until coolant starts to come out.
- Close the valve.
- Open the bleeder screws - 1 and 2 - one after the other until coolant starts to come out.
- Close the bleeder screw.
- Extract coolant until the level is between the MIN. and MAX. marks.
- Install the coolant expansion tank cap.
- Install the noise insulation.