julianschroeder9

Suburban Heat Exchanger Sensor Issue

I'm having trouble with my 2020 Chevrolet Suburban diesel. I think it's the heat exchanger temperature sensor. It has 61524 km. There's an error stored, a message on the speedometer, and the AC won't turn on. Could this be a bad AC control unit?

A 2020 Chevrolet Suburban diesel experienced issues with the heat exchanger temperature sensor, leading to an error message and non-functional AC. The problem was suspected to be either a sensor malfunction or a faulty AC control unit. After a diagnostic scan, it was confirmed that the heat exchanger temperature sensor was faulty. The solution involved replacing and recalibrating the sensor, along with a minor wiring fix, which resolved the issue.

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4 comment(s)

That sounds complex. Have you checked coolant levels? Low coolant can cause similar issues, especially with that sensor. Has any work been done on the engine or cooling system recently?

Coolant levels are fine, and no work has been done recently. Could a sensor malfunction or calibration issue cause this, or is the AC control unit more likely?

Since the coolant is good and no work has been done, it points to a sensor issue or the AC control unit. With the error messages and AC not working, a diagnostic scan at a workshop would be best.

Thanks for the input. The shop confirmed the heat exchanger temperature sensor was bad. Replacement, recalibration, and a minor wiring fix cost 980€. It's working now.

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CHEVROLET

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SUBURBAN