* Thermostat: The thermostat housing is typically located at the top of the engine, at the intake manifold's rear or near the front of the engine block, on the passenger side. It's usually a relatively accessible location once you get past the various hoses and potentially the air intake system.
* Water Pump: The water pump is generally located on the front of the engine block, lower down than the thermostat. It's driven by the serpentine belt, and often has a pulley visible.
Important Note: Without actually seeing the engine bay, these are general locations. Slight variations can exist depending on the specific engine code (e.g., 2.4L vs. another 4-cylinder option if multiple existed for that year). Consulting a repair manual specific to your 1999 Pontiac Grand Am 4-cylinder engine is strongly recommended for precise location and removal/installation procedures. A Haynes or Chilton manual, or an online service manual like those available from Mitchell 1 or AllData, will provide detailed diagrams and instructions.
