Caution: Drained coolant must not be reused. The coolant is poisonous and must not be disposed of with household waste.
Coolant Removal
Warning: For engines 2.0, 4.2 l (AWA, BBK) the cooling system is filled with liquid at the service station using a vacuum pump. If necessary, air is removed from the cooling system at the service station.
1. Remove the bottom cover of the engine compartment, refer to Section Removal and installation of the upper engine cover / lower protection of the engine compartment / subframe.
Caution: When opening the expansion tank on a hot engine, cover the expansion tank with a thick cloth to prevent hot fluid and steam from escaping. The cover may only be removed when the liquid temperature is below + 90°C.
2. Open the cover of the expansion tank.
3. Place a container under the radiator.
4. 1.6, 1.8, 1.9, 2.5L engines and 2.0L ALT engine: Drain the coolant completely from the radiator. To do this, remove the retaining clip (1) coolant temperature sensor (2) from the lower hose and remove the sensor.
5. Engine 1.9, 2.4, 3.0 l: If the radiator has a drain plug (2), turn it to the left and drain the coolant.
Warning: To direct the coolant to a specific location, attach an auxiliary hose to the drain fitting. If there is no drain plug, drain the coolant through the temperature sensor hole (3). To do this, remove the side retaining clip and then remove the temperature sensor.
6. All engines except 2.0 L FSI (AWA), 4.2 l (IN VK) and diesel 2.5 l: Loosen the clamp and slide it all the way back. Remove the hose from the radiator (arrow on accompanying illustration) and drain off any remaining liquid. Then put the hose back on immediately and secure it with the clamp.
Warning: The illustration shows a gasoline engine.
7. Engine 2.0 l AWA: Open the drain plug (1) on the radiator pipe and drain the remaining coolant. Then close it immediately. (2) - fastening nut, (3) - oil filter.
Diesel engine 2.5L
1. Drain the engine coolant. To do this, unscrew the drain plug (2 in the accompanying illustration). (1) – retaining clip for thermal switch (the switch is already out).
2. Remove the coolant hose from the radiator on the left side of the engine. To do this, open the clamp (1) with pliers, e.g. HAZET 798-5 and slide it fully back.
Warning: Hoses (2) And (3) no need to take off.
3. Engine 4.2 l VVK: Remove the drain plug on the thermostat housing and completely drain the coolant.
4. After all the liquid has drained, re-insert the coolant temperature sensor into the lower hose and secure it with the retaining clip. On engines 1.9, 2.4, 3.0 l tighten the drain plug.
5. Put a hose on a radiator and fix it with a collar.
Filling the system with coolant
1. Prepare coolant with 50% potable water and 50% VW/AUDI antifreeze/corrosion protection.
2. Remove the lower cover of the engine compartment, refer to Section Removal and installation of the upper engine cover / lower protection of the engine compartment / subframe.
3. Lower the car onto its wheels.
4. Fill the system with coolant through the expansion tank.
Engines 2.0 l (ALT), 2.4 and 3.0 l
1. Screw on expansion tank fitting AUDI 1274/9 with auxiliary hose Ø 42 mm and length 100 mm or AUDI 1274/8 (IN) with extension 1274/10 (A).
Warning: The fitting is used to prevent fluid overflow after starting the engine. If the specified fitting is not available, you can make it yourself. Instead, you can also remove the expansion tank from the holder, raise it to a height of 10 cm with the hoses connected and secure it in this position with a wire.
2. Remove the water collection cover, refer to Section Removal and installation of a cover of a drainage compartment.
Engine 2.0 l (ALT) and diesel engine 1.9 l
1. Loosen the top hose clamp and slide it back. Move the heater hose back so that the vent hole in the hose (arrow on accompanying illustration) not closed with a connecting fitting.
2. Open the ventilation plug (arrow on accompanying illustration) on the coolant pipe.
3. Fill the system with fluid so that it protrudes through the vents.
4. Close the bleed points in the coolant outlet sequence.
Engines 2.4, 3.0 l
1. Remove the engine front cover (arrows on the accompanying illustration).
2. Remove the vent plug (arrow on accompanying illustration).
3. Fill the system with coolant until it protrudes from the vent hole.
4. Screw in the vent plug with a new sealing ring and tighten it to the torque 15 Nm.
5. Open the heater top hose clamp and slide it back. Pull the heater hose back until the vent hole in the coolant hose (arrow on accompanying illustration) not closed with a connecting fitting.
Diesel engine 2.5L
1. Unscrew the fittings on the wall of the engine compartment by about 2 turns to remove air from the heater hoses (arrow on accompanying illustration).
2. Fill the system with coolant until it emerges from the bleed fittings. Squeeze the upper thick hose several times with your hands. This promotes air release. Tighten the air bleed fittings.
All engines
1. Close the expansion tank.
2. Start the engine and set it to 2,000 rpm for about 3 minutes.
3. Then let the engine idle long enough to warm up the lower radiator hose.
Caution: When opening the expansion tank on a hot engine, cover the expansion tank with a thick cloth to prevent hot fluid and steam from escaping. The cover may only be removed when the liquid temperature is below +90°C.
4. Check the coolant level and, if necessary, add it to the MAX mark.
5. On a warm engine, the fluid level should be at the MAX mark, on a cold engine between the MAX and MIN·marks.
6. Stop the engine.
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