philippfriedrich89
Lexus RC AC and Temperature Sensor Issue
Summary of the thread
A 2018 Lexus RC owner is experiencing an issue where an error message appears on the speedometer, and the air conditioning fails to operate. The error code suggests a defective temperature sensor in the heat exchanger, raising concerns about potential cooling system problems or a sensor malfunction. A similar case was resolved by replacing the AC control unit, which is identified as a common cause of such issues. A diagnostic check at a certified workshop is recommended to confirm the fault and address the problem effectively.
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4 comment(s)
philippfriedrich89 (community.author)
Thanks for the quick reply! No, no recent work on the cooling system at all. That's what's so weird about it. I was hoping it was just a loose connection or something simple, but since you've seen something similar, I'm starting to think it might be the control unit itself. Is that a common problem with our cars? How did you resolve it?
andreashuber5
Yes, that's exactly what it was in my case. While it could theoretically be a faulty sensor or wiring, the defective AC control unit is the more probable cause, especially since the error is triggering multiple issues. To be sure, I would suggest a diagnostic check at a certified workshop. They should be able to pinpoint the exact fault.
philippfriedrich89 (community.author)
Okay, thanks so much for the advice! I really appreciate knowing I'm not alone with this issue. I'll book an appointment with a Lexus workshop and have them check the AC control unit. Hopefully, it's a straightforward fix. Turns out, after the workshop visit, the whole thing including labor will cost 980€ to replace the unit!
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LEXUS
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RC
andreashuber5
I had a similar issue with my RC. If the error message is persistent and the AC isn't working, it's likely the AC control unit. The error code relating to the temperature sensor is a common symptom. Was any work recently done on the car's cooling system?