Cooling System, Draining and Filling
Cooling System, Draining and Filling
Special tools, testers and auxiliary items required
• Adapter (V.A.G 1274/8)
• Drip tray for workshop crane (VAS 6208)
• Hose clamp pliers (V.A.G 1921)
• Cooling system charge unit (VAS 6096)
• Refractometer (T10007)
Draining
Proceed as follows:
CAUTION!
Risk of scalding due to hot steam and hot coolant.
• When the engine is warm the cooling system is under pressure.
• Reduce pressure by covering coolant reservoir cap with a cloth and carefully opening.
- Open coolant reservoir cap.
- Remove noise insulation => Body Exterior 50 noise insulation.
Passat, Rabbit, Scirocco and Eos:
- Remove the air guide pipe - items 1 and 2 - and seal the charge air cooler with a clean cloth.
• Collect escaping coolant in a clean container for disposal or reuse.
- Place drip tray (VAS 6208) under engine.
- Remove the lower coolant hose - 1 - from the radiator and let the coolant drain.
- Remove lower coolant hose to After-Run Coolant Pump (V51) - arrow - and allow coolant to drain.
Tiguan:
- Remove the bolt - 2 - on the bracket for the After-Run Coolant Pump (V51).
• The After-Run Coolant Pump (V51) stays in the installation position.
- Remove the coolant hose - 1 -.
- Remove lower coolant hose to After-Run Coolant Pump (V51) - arrow - and allow coolant to drain.
Vehicles with auxiliary heater:
- Remove the coolant hoses - arrows - and let the remaining coolant drain.
Filling
CAUTION!
Only use tap water for mixing. Well water does not have the quality necessary to ensure proper coolant function.
• Only use coolant additive G 12 Plus Plus conforming 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. For this reason the system must be filled all year round with frost and corrosion protection additives.
• 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 to about -25 °C (in arctic climatic countries to about -35 °C).
• 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), as otherwise frost protection is reduced again and cooling effectiveness is also reduced.
• The refractometer (T10007) is recommended for determining freeze protection density.
• If radiator, heat exchanger, cylinder head or cylinder head gasket is replaced, do not reuse old coolant.
Recommended mixture ratios:
1) The quantity of coolant can vary depending upon the vehicle equipment.
2) Only use clean tap water.
- Connect the lower coolant hose - 1 - to the radiator.
- Connect coolant hose to After-Run Coolant Pump (V51) - arrow -.
Vehicles with auxiliary heater:
- Connect the coolant hoses - arrows -.
- Install noise insulation => Body Exterior 50 noise insulation.
All:
Using cooling system filler unit (VAS 6096):
- Screw adapter (V.A.G 1274/8) on to expansion tank.
- Fill coolant circuit using cooling system filling unit (VAS 6096) => Operating instructions for cooling system filler unit VAS 6096.
Without cooling system filler unit (VAS 6096):
- Slowly fill coolant up to top marking of hatched area on expansion tank.
- Close expansion tank.
- Start engine and maintain an engine speed of about 2000 rpm for approximately 3 minutes.
- Allow engine to run until Coolant Fan (V7) starts running.
CAUTION!
Hot steam may escape when opening expansion tank. Wear protective goggles and protective clothing to prevent damage to eyes and scalding. Cover the cap with a rag and open very carefully.
- Check coolant level and top off if necessary. With engine at operating temperature, coolant level must be at top marking, with engine cold, it must be in center of hatched area.