Cooling System, Filling, High-Voltage System Cooling Circuit
Special tools and workshop equipment required
- Cooling System Charge Kit: VAS6096
Procedure
- Used coolant cannot be used again.
Coolant may only be added when the collected coolant volume is less than 500 ml when replacing components.
If the collected coolant volume is greater than 500 ml, the high-voltage system cooling circuit must be completely drained and refilled.
-- Fill the coolant reservoir on the Cooling System Charge Kit: VAS6096 with 5 liters of premixed coolant in the correct mixture ratio. Refer to Coolant Mixture Ratio for the mixture ratio.
-- Install the Cooling System Charge Kit: VAS6096 onto the coolant expansion tank -1- still connected to the Cooling System Tester - Adapter : VAG1274/8 .
-- Place the drain hose -2- in a small container -3-.
TIP:
A small amount of coolant which should be collected is drawn off with the discharged air.
-- Close the valves -A and B- by turning lever at a right angle to the flow direction.
-- Connect the hose -4- to compressed air.
- Pressure: 8 to 10 bar (116.03 to 145.04 psi) positive pressure.
-- Open the valve -B- by turning the lever in the flow direction.
- The suction jet pump generates vacuum in the coolant system; indicator on display instrument must move into green area.
-- Briefly open the valve -A- by turning the lever in the flow direction so that the hose on the Cooling System Charge Kit : VAS6096 coolant reservoir fills with coolant.
-- Close the valve -A- again.
-- Leave the valve -B- open another two minutes.
- More pressure is generated in the coolant system by the suction jet pump; indicator on display instrument must stay in the green area.
-- Close the valve -B-.
- Needle in the display instrument must remain in the green region, then the sufficient vacuum in the cooling system is obtained for the upcoming filling.
TIP:
Repeat the procedure if the needle goes below the green range.
Check the cooling system for leaks if the pressure drops.
-- Remove the pressure hose.
-- Open the valve -A-.
- Coolant is extracted from the Cooling System Charge Kit: VAS6096 coolant reservoir by pressure in the coolant system and the system is filled.
-- Remove the Cooling System Charge Kit: VAS6096 from the Cooling System Tester - Adapter: VAG1274/8 on the coolant expansion tank.
Continuation of the Filling Procedure:
-- Bleed the cooling system. Refer to COOLING SYSTEM, BLEEDING, HIGH-VOLTAGE SYSTEM COOLING CIRCUIT .