hermann_steel2

GLC AC Issue Temperature Sensor

My 2018 Mercedes GLC with a gasoline engine is acting up. I'm getting an error message in the speedometer and the AC won't switch on. Diagnostic says it's the temperature sensor on the heat exchanger. Has anyone else run into this? Seems like a defective AC control unit is the culprit. Quoted almost 1000€ to fix it. Also, the error memory has some stuff logged. Is this heat exchanger thing common?

4 comment(s)

Hmm, sounds familiar. I have a GLC as well. Was there any sign of a coolant leak? My temperature gauge was acting strangely before my AC completely gave up. Did they mention anything about sensor calibration? I wonder if it's the same issue.

No visible coolant leak that I could see. The temperature gauge seemed normal before the error. The shop mentioned something about the sensor needing adaptation after the new unit is installed. Is this what you mean by sensor calibration? Did yours throw the same error codes?

Yes, adaptation is what I meant. In my case it was very similar. The error codes pointed to the heat exchanger sensor. Eventually the whole AC stopped working. The temperature gauge behaved normally most of the time, then suddenly it didn't. If it's the AC control unit, that price sounds about right. Better get it sorted before summer hits!

Sounds like I'm headed for the workshop then. Good to know someone else had a similar experience. At least I know what to expect. I appreciate the help!

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