Overheating?

Hi,

You indicated a radiator temperature sensor. Are you referring to the engine coolant temperature sensor at the rear of the left side cylinder head? See pic 1.

Also, can you get your hands on an infrared thermometer and check the radiator temperature when the gauge indicates it is overheating?

Let me know as much as you can. Also, let me know if the check engine light is staying on while the engine is running.

Take care,

Joe

See pic below.

Hi,

If you have access to an infrared thermometer, check the radiator temperature when the engine is overheating. If you don't, we need to check the wiring.

At the sensor, there are two wires in the connector. One is a power supply (5v from PCM) and the other is a return voltage to the PCM. The sensor resistance is at its highest when cold.

As the engine coolant temperature increases, resistance (voltage) in the sensor decreases. As temperature decreases, resistance (voltage) in the sensor increases.

If you look at the pic below, I attached the connector view. With the connector disconnected, check pin 1 for a 5v reference. If that appears good, then reconnect the sensor and back probe pin 2 to check the return voltage. It should be a good bit lower than the 5v.

Let me know what you find.

Take care,

Joe