* Most common location: It's a single-wire sensor screwed into the engine block, near or at the thermostat housing. You might need to look closely around that area. It's usually a smaller sensor compared to other components around it.
* Less common location: Some variations might have the sensor located in the intake manifold. This would require a more detailed inspection of the intake manifold itself.
To find it with certainty:
1. Consult a repair manual: A repair manual specific to your 1997 Pontiac Transport (with the correct engine size) will have diagrams and precise locations. This is the most reliable method.
2. Use a wiring diagram: Tracing the coolant temperature sensor wire from the engine control module (ECM) can lead you directly to the sensor.
3. Visual Inspection: Carefully inspect the area around the thermostat housing and intake manifold. Look for a sensor with a single wire connector that has a threaded body.
Important safety note: The engine must be cool to the touch before attempting to locate or replace the sensor. Be careful when working around hot coolant or other engine components.
