Lexus NX AC failure

Alright, I'm officially pulling my hair out. My 2019 Lexus NX hybrid is throwing me for a loop. I'm getting an error stored in the error memory, plus a warning light on the dash, and the AC won't kick on. Mileage is pushing 150k km. I'm suspecting a defective temperature sensor in the heat exchanger, potentially tied to the AC control unit. Anyone else seen this nightmare?

4 comment(s)

Sounds familiar. I had a similar issue with my NX. The AC cutting out is a real pain. Did you check for any coolant leaks around the heat exchanger? Also, have you tried any kind of sensor calibration or reset through the car's system or an OBD reader?

No visible leaks, and I haven't tried a sensor calibration. I don't have the equipment for that. Was your problem definitely the temperature sensor, or something else related to the AC?

Yeah, mine ended up being a faulty temperature sensor linked to the AC control unit. The error codes pointed directly to it. Given your symptoms, it's worth getting it properly diagnosed by a workshop with the right tools. It's likely the AC control unit defective. Don't delay it or the compressor can get damaged.

Thanks for the insight! Took it to my local shop, and you called it. Defective temperature sensor in the heat exchanger. Quoted 980€ for the repair. Ouch, but at least I know what's up. Cheers!

Join the discussion now: