GM 12645126 Water Pump Assembly

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Water pump failure can lead to overheating and serious engine damage. There are several ways to check the operation of the water pump while it is installed on the engine. If any of these checks indicate problems with the water pump, it should be replaced immediately. One way to check is to inspect the weep hole in the water pump snout for coolant leakage, indicating a failed seal. Another way is to listen for a high-pitched squealing sound coming from the water pump during engine operation, indicating a failed shaft bearing. Excessive bearing wear can be identified by attempting to move the water pump pulley horizontally or vertically. If it can be moved, the bearing is nearing the end of its service life. Additionally, the effectiveness of the water pump can be checked by removing it for examination, as the impeller fins may corrode away. To replace the water pump, the coolant must be drained and various components such as the air cleaner assembly, radiator shroud, fan/clutch assembly, and drive belt must be removed. The specific steps for removal and installation vary depending on the engine type. After installation, coolant should be added to the specified level, the engine should be started, and the coolant level should be checked. It is important to bleed the cooling system of air and check for any coolant leaks around the water pump and hoses.

After installation, coolant should be added to the specified level, the engine should be started, and the coolant level should be checked. It is important to bleed the cooling system of air and check for any coolant leaks around the water pump and hoses.