* Coolant Temperature Sensor (CTS): This sensor sends a signal to the engine control module (ECM) for the fuel injection system. It's crucial for proper engine operation and fuel management. It's usually a one-wire or two-wire sensor and might be smaller than the sender.
* Coolant Temperature Sender (CTS - often labeled differently, sometimes just a gauge sender): This sender provides a signal to the instrument cluster gauge to show the engine's coolant temperature. It's usually a single-wire sensor.
To locate them definitively:
1. Consult your vehicle's repair manual: This is the best resource. The manual will show you exactly where the sensors are located, with diagrams and specifications.
2. Look near the thermostat housing: This is the most common location. The thermostat housing is usually located on the passenger side of the engine, towards the front.
3. Examine the wiring harnesses: Follow the wiring harnesses originating near the thermostat housing that connect to sensors. These wires usually go to the ECM (engine control module) and the instrument cluster.
4. Use a visual inspection: Look for two sensors near the thermostat housing that are approximately the size and shape of sensors commonly used for coolant temperature.
Important Note: If you're unsure about working on your engine's cooling system, it's best to take your vehicle to a qualified mechanic. Improperly handling the cooling system can lead to serious damage.
