Remove the coolant hose from the left coolant pipe by loosening the hose clamp -arrow- and drain the coolant.
Remove the drive shaft cover -1- in the left wheel arch.
Remove coolant hose -arrow- from lower right coolant pipe, lift retaining clip and drain remaining coolant.
Refueling
The ignition is turned off.
Note: The cooling system is filled with coolant solution and coolant additives for the entire year. Only use coolant according to the Electronic Parts Catalog. Other additives can significantly reduce the anti-corrosion effect. The resulting damage can lead to coolant leakage and, as a result, serious engine damage. Coolant with the correct mixture ratio prevents the formation of corrosion and limescale. In addition, they increase the boiling point. Therefore, concentrate must be present in the cooling system throughout the entire period. Especially in countries with a tropical climate, due to the increased boiling point of the coolant, it ensures reliable engine operation under high load. The freezing temperature of the coolant should be at least -25°C, in countries with an arctic climate at least -35°C. It is prohibited to reduce the additive content in the coolant by adding coolant, even in the warm season or when operating in countries with a warm climate. The proportion of concentrate must be at least 40%. If, due to climatic conditions, it is necessary to use coolant with a lower freezing point, the content of the coolant additive can be increased to 60% (coolant freezing point -40°C). With a different proportion, the freezing point of the coolant decreases, and, in addition, the efficiency of the cooling system decreases. To mix coolant, use only clean drinking water. When replacing the radiator, heater heat exchanger, cylinder head, cylinder head gasket or cylinder block, reuse of drained coolant is prohibited. Contaminated coolant cannot be used for further use. To check the freezing point of the coolant, use a refractometer -T10007-.
Component ratio in coolant
Additive (40%) and coolant (60%) to ensure a freezing temperature of -25°C.
Additive (50%) and coolant (50%) to ensure a freezing temperature of -35°C.
Additive (60%) and coolant (40%) to ensure a freezing temperature of -40°C.
Install the coolant hose onto the lower right coolant pipe. Connect coolant hose to left coolant pipe -arrow-. Screw in the drain plug -arrow- with a new seal. ring into the connecting fitting.
Fill the reservoir of the cooling system filler with at least 12 liters of pre-mixed coolant in the correct proportion: Screw the cooling system tester adapter -VAG 1274/8- to the extension. tank. Install the coolant filling tool onto the adapter -VAG 1274/8-. Place the bleeder hose -1- into a small container -2-. The exhaust air entrains a small amount of coolant, which must be collected. Close valves -A- and -B- by turning them perpendicular to the direction of flow. Connect hose -3- to compressed air. Pressure: overpressure 6...10 bar.
Open valve -B- by turning it in the direction of flow. A vacuum is created in the cooling system using an ejection pump; the indicator arrow should be in the green field. Open tap -A- briefly, turn it parallel to the direction of flow so that the hose of the reservoir tank of the device for filling the cooling system is filled with coolant. Close tap -A- again. Open tap -B- for 2 minutes. A vacuum continues to be created in the cooling system using the ejection pump; the indicator arrow should be in the green field. Close tap -B-. The indicator arrow should remain in the green field, in which case there is sufficient vacuum in the cooling system for subsequent refilling.
If the arrow is below the green field, you should repeat the previous operations. When the vacuum decreases, check the cooling system for leaks. Remove the compressed air hose. Open tap -A-. Thanks to the vacuum, the coolant leaving the reservoir for filling the cooling system fills the system. Remove the filling tool from the adapter -VAG 1274/8- for extension. cooling system reservoir. Place tube -VAG 1274/10- onto adapter -VAG 1274/8-. Fill with coolant until the cooling system tester tube is completely filled. If necessary, add coolant while removing air.
Remove engine cover -arrows-. Unscrew the vent plug -arrow- of the front coolant pipe to allow the coolant to escape. Close the plug.
Unscrew the vent plug -arrow- of the rear coolant pipe to allow the coolant to escape. Close the plug.
Remove gasket -3-. Release the mounting clips -1- from the mountings and remove the plenum chamber cover -2-
Loosen and remove the coolant hose to the heat exchanger until the coolant comes out of the vent hole -arrow- in the coolant hose. Place the coolant hose onto the connecting fitting and secure it with a spring clamp.
On vehicles with auxiliary heater, turn on the heater for approx. for 30 seconds. Close the extension cover. tank. Start the engine. Set the temperature for all zones to "NG and, if possible, set the lowest ventilation level (= 0). Turn off the air conditioning compressor by pressing the AC button. The tester LED in the button should not light up. The engine should run at 2000 rpm for 3 minutes. Leave the engine idling until the 2 large coolant hoses on the radiator warm up. The engine should run at 2000 rpm for 2 minutes. Turn off and allow the engine to cool. Install sound insulation screens and drive shaft covers. Check coolant level. When the engine is cold, the coolant temperature level should be at the mark "MAX". If the engine is warm, the coolant level may be above the mark "MAX".
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