Replace the timing belt and consider the tensioner when replacing the water pump, since the pump is timing-belt driven and the belt is overdue at 160,000 miles. The thermostat is relatively easy, but the water pump and timing belt should be done by a competent mechanic.
The owner of a 1994 Toyota Camry with 160,000 miles asked where the water pump is and how difficult the pump and thermostat are to replace. The expert said both four-cylinder and V6 pumps are driven by the timing belt, which is overdue and should be replaced, and recommended considering the tensioner. The thermostat is easy, but the pump and belt job requires a good mechanic.
