Toyota 16110-16020 Water Pump Assembly, W/O Coupling

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A faulty water pump can cause engine overheating and damage due to poor coolant circulation. Two checks can determine if the pump is defective. The pump body has a "weep hole" underneath. If the pump seal fails, coolant drips from this hole, visible from under the engine. Raise the vehicle and use a flashlight to check for leakage. If the pump shaft bearing fails, it emits a squealing sound. Don't confuse this with drivebelt slippage. Check for shaft wear by moving the pulley up and down. If there's excessive side play, the shaft or bearing is worn and the pump needs replacing.

The upper and middle timing belt covers should be removed.