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horstvogel4

Prius AC Error

My 2002 Toyota Prius (hybrid) is showing some weird behavior. 131780 km on the clock. I'm getting an error stored in the error memory, plus an error message on the speedometer. Also, the AC won't switch on. Suspect a defective temperature sensor in the heat exchanger. Anyone seen this before?

Summary of the thread

A 2002 Toyota Prius is experiencing an AC error, with an error message on the speedometer and the AC not functioning. The initial suspicion is a defective temperature sensor in the heat exchanger. A similar issue in another vehicle was resolved by replacing a faulty air conditioning control unit. After inspection, it was confirmed that the AC control unit was the problem, and the issue was resolved by the workshop.

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4 comment(s)

maxdragon1

Sounds familiar. Had similar symptoms with my old Saab 9-3, though it turned out to be a sensor malfunction in the HVAC system. Have you checked for any coolant leaks around the heat exchanger? That could mess with the sensor readings.

horstvogel4 (community.author)

Thanks for the tip. Coolant levels seem fine, no visible leaks. I'm leaning towards a sensor calibration issue, but not sure where to start. Was your Saab issue definitely a bad sensor, or could it have been something else?

maxdragon1

In my case, after some diagnostics, the workshop told me that the air conditioning control unit was defective. I was quoted about 980€ for the repair. So I suggest you go to the workshop to have your car inspected.

horstvogel4 (community.author)

Appreciate the insight. Turns out the AC control unit was indeed the culprit. Workshop confirmed, and got it sorted. Thanks again!

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TOYOTA

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PRIUS