maximilian_bauer66
i40 AC and Temperature Sensor Issue
Summary of the thread
A 2016 Hyundai i40 is experiencing issues with the AC not turning on and an error message on the speedometer, linked to a defective temperature sensor heat exchanger. The coolant levels are fine, suggesting the problem might be a sensor malfunction. A similar case was resolved by addressing a faulty AC control unit, which affected the temperature sensor readings. It is recommended to have the AC control unit checked by a workshop to confirm the issue and avoid further complications.
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4 comment(s)
maximilian_bauer66 (community.author)
Interesting! I hadn't considered the AC control unit itself. Where is that located, and is there an easy way to test it before I start replacing parts? Is it something I can troubleshoot myself or would you recommend taking it to the shop?
majadunkel30
Honestly, finding it and properly testing it can be a bit tricky without the right tools. It's usually buried somewhere behind the dashboard. Given the symptoms and the error code, it might be better to get it checked out by a workshop. I ended up doing that, and they confirmed the faulty AC control unit was causing the sensor errors. Saved me a lot of guesswork and potential further issues. My repair cost around 980€, just so you have a ballpark figure.
maximilian_bauer66 (community.author)
Thanks for the insight! I'll take it to a reputable workshop and have them diagnose the AC control unit. Hopefully, it’s the same issue and I can get it sorted out. Appreciate the help!
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HYUNDAI
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I40
majadunkel30
Hey there! I have a Hyundai i40 too, though not sure about the exact year. Your issue sounds familiar. I had similar symptoms – AC refusing to kick in and a weird error popping up. For me, it turned out to be a problem with the AC control unit, which then messed with the temperature sensor readings. It's like when a fuse blows in your house and takes out the lights in multiple rooms. Have you checked the AC control unit?