Coolant temperature sensor (Honda Accord 3)

The coolant temperature sensor is a variable resistor. Changes in coolant temperature are reflected in the temperature sensor readings on the instrument cluster. This sensor should not be confused with other temperature sensors related to engine management or fuel system, as well as air conditioning control sensors. Some models have up to 6 sensors and switches that respond to coolant temperature.

On carbureted 1984-89 ACCORDs, the sensor is located at the base of the intake manifold. There are usually several other sensors and hoses located near it, but it is distinguished by its own power supply wire; it is the only one not accompanied by a vacuum hose. On ACCORD 1990-91 cars the temperature sensor is located behind the cylinder head, it is the smallest of the sensors located there.

On carbureted 1984-87 PRELUDEs, the temperature sensor is located low on the intake manifold, below the EGR valve. On 1988-90 PRELUDEs, both carbureted and fuel injected, the sensor is located on the thermostat housing behind the cylinder head. The sensor is identified by a single wire lead that is not accompanied by a vacuum hose.

1. With the ignition off and the engine cold, drain the coolant to a level clearly below the sensor location.

2. Disconnect the wire from the sensor or from the harness connector.

3. Remove the sensor using a wrench of the appropriate size. Save the coolant that runs out.

4. Install the new sensor, tightening it to 9 Nm.

5. Connect the wiring.

6. Add coolant to the proper level.