A coolant leak may develop from the water pump. The engine may overheat as a result of the coolant loss. A leaking water pump should be replaced.
Car Problem Reports
Pontiac Aztek Leaking Water Pump May Cause Coolant Loss and Overheating
Pontiac Aztek Problem
Engine Affected: 3.4L V6
Average Mileage: 116,333 mi (65,000 mi - 150,000 mi)
water pump started leaking (could smell it). replaced with no problems.
Visitor, 2002 Pontiac Aztek, 150,000 mi
had to replace intake manifold gasket due to that