Removal and installation the water pump of the VR6 engine (VW Sharan 1)

• if your car has a radio, before disconnecting the battery terminals, make sure you have its security code with you;
• disconnect the battery no sooner than 20 seconds after turning off the ignition. This ensures that the so-called "hot wire" in the air flow meter has stopped functioning;
• The battery should only be disconnected when the ignition is switched off to avoid damage to the ignition and injection system ECU;
• when replacing the water pump, it may be necessary to replace the coolant as well, if it has already been in the system for a long time.

Fig. 190. Location of other parts of the VR6 engine cooling system: 1 - bolt, 25 Nm; 2 - water pump pulley; 3 - bolt, 20 Nm; 4 - water pump; 5 - O-ring, always replaceable; 6 - thermostat housing; 7 - from the cylinder head; 8 - engine cooling pump after engine stop; 9 - rubber holder; 10 - plug connector of the engine cooling pump after it has stopped; 11 - throttle body; 12 - to the heat exchanger; 13 - lid; 14 - bolt, 10 Nm; 15 - expansion tank; 16 - plug-in block, black; 17 - from heat exchanger; 18 - Upper coolant hose; 19 - radiator for automatic transmission (if installed); 20 - Lower coolant hose; 21 - oil radiator; 22 - to the cylinder block; 23 - drain plug thread, 10 Nm; 24 - Coolant pipe

• unscrew the drain plug 23 (Fig. 190) in the cooling system pipeline 24 running along the engine, drain the coolant. Then immediately screw in the drain plug;
• disconnect the exhaust pipe from the catalytic converter. The nuts can be discarded immediately, as they need to be replaced with new ones;
• disconnect the fuel hose from the cylinder head;
• remove the high voltage wires from the spark plugs and remove the high voltage wire guide from the ignition coil side and from the pipe side. Unscrew the bolts securing the central cover and remove it;
• remove the air filter housing completely;
• remove the air flow meter;

Note: If the terminals from the battery have not yet been removed, check that the ignition has been off for at least 20 seconds.

• remove the V-belt;
• remove the vacuum hose from the fuel pressure regulator (upper part of the intake manifold);
• disconnect the vacuum hose leading to the brake booster located at the top of the intake manifold;

Fig. 191. Location of the coolant temperature sensor connector (shown by arrow)

• disconnect the connector block (Fig. 191) of the coolant temperature sensor and unscrew the sensor from the upper part of the intake manifold;
• secure the engine to the appropriate loops and use a lift to slightly raise the engine so as to relieve its suspension;
• remove the right front engine mount;
• slowly lower the right side of the engine (drive) until the water pump pulley is accessible, making sure that no connections, pipes, wires, hoses, etc. are under tension.;
• fix the water pump pulley in a stationary position, unscrew the mounting bolts and remove the pulley;
• unscrew the mounting bolts and remove the water pump. To remove the pump, move the engine slightly to the left to free up some space and remove the pump. The sealing ring is still on the pump and should be replaced with a new one.

Note: Check the pump after removal for oil leaks (which are most often marked by rust) and rotate the hub to assess the condition of the bearing.

• tighten the pump mounting bolts to 20 Nm and the pulley mounting bolts to 25 Nm;
• put on the drive belt and adjust its tension (see subsection 5.7).