However, it's almost always located in or near the coolant reservoir tank itself. It's a small sensor, often with a single wire connected to it. Look for a sensor sticking into the tank, or mounted on the side of the tank.
To locate it with certainty:
1. Consult a repair manual: A Chilton's or Haynes repair manual specific to your 1992 Pontiac Grand Prix will have diagrams showing the exact location of all sensors, including the low coolant sensor. This is the most reliable method.
2. Visually inspect the coolant reservoir: Carefully examine the coolant reservoir tank. Look for a sensor that appears to measure the coolant level. It might be a float-type sensor or a sensor that's triggered by a change in the level of the coolant inside the tank.
3. Trace the wiring: If you can't find a sensor directly on the reservoir, look for a single-wire sensor in the general area of the engine compartment related to the coolant system. Trace the wire back to see where it connects. This is a more advanced technique and requires some understanding of automotive wiring.
Remember to always let the engine cool completely before attempting any work near the coolant system. Hot coolant can cause severe burns.
