Procedures
Draining and Filling
Special tools, testers and auxiliary items required
• Adapter (V.A.G 1274/8)
• Drip Tray for VAS 6100 (VAS 6208)
• Hose Clip Pliers (V.A.G 1921)
• Cooling System Charge Unit (VAS 6096)
• Refractometer (T10007)
Draining
The coolant system is under pressure when the engine is warm.
Risk of scalding due to hot steam and hot coolant.
Reduce pressure by covering the coolant expansion tank cap with a cloth and open carefully.
- Open the coolant expansion tank cap.
- Remove the noise insulation.
Passat, CC, GTI and Eos:
- Loosen the clamps - items 1 and 2 -, remove the charge air hose and seal the charge air cooler with a clean cloth.
• Collect leaking coolant in a clean container for disposal or reuse.
- Place the drip tray (VAS 6208) under the engine.
- Remove the lower coolant hose - 1 - from the radiator and let the coolant drain.
- Remove the lower coolant hose from the after-run coolant pump (V51) - arrow - and allow the coolant to drain.
Tiguan:
- Remove the after-run coolant pump bracket bolt - 2 -.
• The after-run coolant pump stays in the installed position.
- Remove the coolant hose - 1 -.
- Remove the lower coolant hose from the after-run coolant pump - arrow - and allow the coolant to drain.
Filling
• 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. For this reason, we recommend using distilled water for older models when adding coolant or filling coolant for the first time. On newer models (from MY 10), distilled water is required.
Only use distilled water for mixing with G12 plus-plus. Using distilled water provides optimum corrosion protection.
• Only use coolant additive G 12 plus-plus that conforms to TL VW 774 G.
• Coolant additives with the note "conforming to TL VW 774 G" prevent frost and corrosion damage, scaling and also raise boiling point of coolant. 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.
• Protection against frost must be assured 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 for climatic reasons a greater frost protection is required, the amount of coolant additive of can be increased, but only up to 60% (frost protection to about -40 °C (-40 °F), as otherwise frost protection is reduced again and cooling effectiveness is also 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 old coolant.
Recommended Mixture Ratios:
1 The amount of coolant may vary depending on vehicle equipment.
- Connect the lower coolant hose - 1 - to the radiator.
- Install the charge air hose.
- Connect the coolant hose to the after-run coolant pump - arrow -.
- Install the noise insulation.
Filling with Cooling System Charge Unit (VAS 6096) :
- 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.
Filling without Cooling System Charge Unit (VAS 6096) :
- Slowly fill the coolant up to the upper mark in the hatched area on the expansion tank.
- Close the expansion tank.
- Start the engine and maintain an engine speed of about 2000 RPM for approximately 3 minutes.
- Allow the engine to run until the coolant fan (V7) starts running.
The coolant system is under pressure when the engine is warm.
Risk of scalding due to hot steam and hot coolant.
Reduce pressure by covering the coolant expansion tank cap with a cloth and open carefully.
- Check the coolant level and add coolant if necessary. When the engine is at operating temperature, the coolant must be at the top mark. When the engine is cold, the coolant must be in the center of the hatched area.