Car engine cooling system Audi A8 D2

General information about the cooling system
The cooling system is a closed liquid system, includes a water pump with an auxiliary belt drive from the crankshaft, a radiator fan with a thermoviscous...

Removal and installation the thermostat
Removal Fig. 7–1. Water pump and thermostat for vehicles with 2.8L gasoline engines: 1 – thermostat; 2 – sealing ring; 3 – thermostat housing; 4 – bolt, 10 Nm;...

Replacing the coolant
Below is a description of how to replace the coolant in cars with 2.8L petrol engines. Replacing the coolant in cars with other engines is similar. It is...

Water pump for 2.8L petrol engines
Removal Warning: To prevent the water pump pulley from turning, use special tool 3212. Drain the coolant. Remove the poly V-belt. Unscrew the bolt while...

Cooling system connecting pipes
Small middle pipe of cooling system of petrol engine 2.8 l Removal Drain the coolant. Take it off intake manifold . Fig. 7–9. Cooling system pipes of a 2.8 l...

Water pump for petrol engines 3.7 and 4.2 l
Removal Drain the coolant. Remove the timing belt. Remove the timing belt tensioner mechanism. Fig. 7–15. Water pump for 3.7 and 4.2 l petrol engines: 1 –...

Thermostat for petrol engines 3.7 and 4.2 l
The thermostat is located on the front right side of the engine under the intake manifold. While turning the water pump shaft, check the condition of the water...

Water pump for diesel engines 2.5 l
Removal Drain the coolant. Remove the timing belt. Remove the front section of the intake manifold. Fig. 3.3–58. Location of screws for fastening the left (1),...

Thermostat for 2.5L diesel engine
Drain the coolant. Remove the timing belt. Fig. 3.3–58. Location of screws for fastening the left (1), upper (2) and right (3) toothed belt covers Loosen the...

Front section of the cooling system pipe of the 2.5L diesel engine
Removal Before disconnecting the battery, find out if you have a radio activation code. Turn off the ignition and disconnect the ground wire from the battery....

Left section of the cooling system pipe of a 2.5L diesel engine
Removal Drain the coolant. Remove the mechanical EGR valve. Fig. 7–21. Location of clamps (1 and 2) and bolt (3) for fastening the left section of the cooling...

Right section of the cooling system pipe of the 2.5L diesel engine
Removal Drain the coolant. Fig. 3.3–24. Location of engine casing mounting screws Loosen the screws and remove the engine casing (see Fig. 3.3–24). Fig. 3.3–4....

Central section of the cooling system pipe of a 2.5L diesel engine
Removal Drain the coolant. Remove the oil filter bracket. Unscrew the bolts securing the central section of the cooling system pipe and, by pulling, remove the...

Water pump for diesel engines 3.3 l
Removal Drain the coolant. Remove the timing belt. Fig. 3.4–55. Location of guide roller and rear toothed belt cover mounting bolts Unscrew the guide roller...

Thermostat for 3.3L diesel engines
The thermostat is located in a housing mounted on the engine cylinder block. Drain the coolant. Remove the timing belt from the camshaft pulleys. Unscrew the...

Front middle pipe of cooling system of diesel engine 3.3 l
Removal Drain the coolant. Remove the timing belt. Fig. 3.4–55. Location of guide roller and rear toothed belt cover mounting bolts Unscrew the guide roller...

Left middle pipe of the cooling system of a 3.3L diesel engine
Removal Drain the coolant. Fig. 3.4–3. Location of the clamps for fastening the cooling system hoses to the heater fittings on the engine compartment bulkhead...

Removal and installation the radiator
Removal Warnings: Drained coolant must be collected and disposed of. When opening the expansion tank cap on a hot engine, be careful because the escaping steam...

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