Coolant, Draining And Filling
Special tools and workshop equipment required
- Refractometer T10007A
- Cooling System Tester - Adapter VAG1274/8
- Cooling System Charge Kit VAS6096
- Shop Crane - Drip Tray VAS6208
- Hose Clip Pliers VAS6362
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 opening carefully.
-- Open the coolant expansion tank cap.
-- Remove the noise insulation.
GTI and Tiguan, refer to Description and Operation
Eos and Passat, refer to "Noise Insulation" in Removing .
CC, refer to "Noise Insulation" in Description and Operation
GTI, Eos, Passat and CC
-- Reposition the charge air hose clamps -1 and 2-, remove the hose and plug the charge air cooler with a clean cloth.
-- Place the Shop Crane - Drip Tray VAS6208 under the engine.
-- Remove the lower coolant hose -1- from the radiator and allow the coolant to drain.
-- Remove the lower coolant hose -arrow- from the After-Run Coolant Pump -V51- and allow the coolant to drain.
Tiguan
-- Remove the After-Run Coolant Pump -V51- bracket bolt -2-.
The After-Run Coolant Pump -V51- stays in the installed position.
-- Remove the coolant hose -1-.
-- Remove the lower coolant hose from the After-Run Coolant Pump -V51- -arrow- and allow the coolant to drain.
Filling
Always 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. Based on the contents, the country or even the region specific quality can be different. Use distilled water. For this reason, we recommend using distilled water when adding coolant or filling coolant for the first time.
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 contributes to engine reliability under heavy loads, particularly in countries with tropical climates.
The Refractometer T10007A MUST be used to determine the freeze protection value.
Protection against frost must be assured down to minimum -25 °C (-13 °F) (in arctic climatic countries down to approximately -36 °C (-32.8 °F)). When stronger freeze protection is needed due to the climate, the freeze protection may be increased. But only up to -48 °C (-54 °F), otherwise the effectiveness of the coolant decreases.
The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The frost protection must be at least -25 °C (-13 °F).
Read the freeze protection value on the scale for the coolant additive that has been added.
The temperature on the Refractometer T10007A corresponds to the >>freezing point<<. At this temperature, ice crystals may begin to form in the coolant.
Do not reuse used coolant.
Only use water/coolant additive to lubricate the coolant hoses.
Recommended Mixture Ratios
| Freeze Protection to: | Coolant Additive | Coolant Additive (1) | Distilled Water (1) | ||
|---|---|---|---|---|---|
| -25° C (-13° F) | 40% | 3.2 liters (3.38 quarts) | 4.8 liters (5.07 quarts) | ||
| -36° C (-33° F) | 50% | 4.0 liters (4.22 quarts) | 4.0 liters (4.22 quarts) | ||
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-- Connect the lower coolant hose -1- to the radiator.
-- Install the charge air pipe.
-- Connect the coolant hose -arrow- to the After-Run Coolant Pump -V51-.
-- Install the noise insulation.
GTI and Tiguan, refer to Description and Operation
Eos and Passat, refer to "Noise Insulation" in Removing .
CC, refer to "Noise Insulation" in Description and Operation
Filling Using the Cooling System Charge Kit VAS6096
-- Install the Cooling System Tester - Adapter VAG1274/8 onto the expansion tank.
-- Fill the coolant circuit using the Cooling System Charge KitVAS6096, refer to the operating instructions for the Cooling System Charge Kit VAS6096.
Filling Without Using the Cooling System Charge Kit VAS6096
-- Slowly fill the coolant up to the upper mark in the hatched area on the expansion tank.
-- Close the expansion tank cap.
-- Start the engine and maintain an engine speed of about 2000 rpms for approximately 3 minutes.
-- Allow the engine to run until the coolant fan 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 level must be at the top mark. When the engine is cold, the coolant level must be in the center of the hatched area.