The Audi TT Water Pump circulates the coolant in the engine and radiator to avoid overheating. Fitted to the engine block of an Audi engine, the pump takes the coolant through the lower radiator hose of the Audi vehicle, forces it into the inner jacket of passages in the block, and then directs the heated fluid to the thermostat and radiator where the heat is dispersed. Within the Water Pump casing, a rotating shaft is mounted on bearings in many modern designs, usually of aluminum casting. An impeller attached to the other end is driven by a belt-driven pulley at one end of the shaft or, in some cases, an integrated electric motor. With the rotating impeller, this causes the constant flow that maintains the desired temperature within the desired range when the TT is in movement or idling. The shaft is surrounded by a seal that prevents the coolant from reaching the bearings to ensure that the lubricant remains intact and there is no leakage. Constant circulation provided by the Water Pump also ensures even distribution of engine temperature throughout the cylinder head and block, preventing thermal stress to delicate parts. A worn seal, broken bearings, or a broken impeller may result in loss of coolant, unusual noise, or reduced flow, causing overheating. Simple monitoring of coolant level and early symptoms are applied to keep the Water Pump functional in any Audi cooling circuit to maintain the reliable performance that is expected of an Audi TT on the road.
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