Overheating?

2012 DODGE DURANGO
68,000 MILES • 3.6L • V6 • AUTOMATIC
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CRIS8204
  • MEMBER
  • 2 POSTS
My vehicle listed above Citadel marks its overheating but there is no gurgling noise. we have already changed the thermostat radiator temperature sensor and the cooling fans and other sensors, I even put in a new motor but it's still says overheating like before I put in the new motor.
Mar 28, 2023 at 10:40 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
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.
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Mar 29, 2023 at 8:26 PM
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CRIS8204
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We already put in that sensor we already checked the water pump and it okay. it mark its over heading but there no gurgling water noting.
Mar 29, 2023 at 11:47 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
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
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Mar 30, 2023 at 6:58 PM