Nemo AC Temperature Sensor Issue

I have a 2009 Citroen Nemo diesel. The temperature sensor for the heat exchanger appears to be defective. Symptoms include an error stored in the error memory, an error message on the speedometer, and the air conditioning system refusing to activate. Mileage is 190283 km. Diagnosis points to a faulty air conditioning control unit. Any experience?

4 comment(s)

That sounds familiar! I've got a Nemo too. I had a similar issue where the AC wouldn't kick on and the dashboard was lighting up with errors. Was your mechanic able to check for a coolant leak or sensor calibration issues?

Coolant levels are normal, and I've attempted sensor calibration without success. The error codes specifically indicate a malfunction within the heat exchanger temperature sensor circuit. Did your issue also point to the sensor itself?

Yes, exactly the same! Mine ended up being a deeper HVAC system problem. I’d suggest getting a professional to look at it. Probably time to visit a reputable workshop.

Confirmed. Workshop diagnosed it as a defective air conditioning control unit, as suspected. Repair cost 980€. Thanks for the input.

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