Seat Ateca automatic temperature control malfunction

Sounds like you're having a similar issue to what I had with my old Skoda Octavia. The climate control went haywire, and it turned out to be a faulty temperature sensor. Does the error memory specifically mention the interior temperature sensor? That was the key for me.

Yes, the error memory does specifically mention the interior temperature sensor. Did you end up replacing the sensor yourself, or did you take it to a mechanic? And was it expensive?

Okay, if the error memory is pointing directly to the interior temperature sensor, and given the symptoms you're describing, it's highly likely that's the culprit. I didn't replace the sensor myself as I wasn't confident enough, I am no expert. Instead, I took it to a local mechanic. The sensor diagnostics pointed to sensor replacement. In the end, it was an easy fix for them. Given your suspicion about the cable or plug connection, it's worth having a professional take a look. It could save you time and potential further damage. I would recommend going to the workshop.

I took my Ateca to the workshop, and they confirmed it was the interior temperature sensor. They replaced it, and now the climate control is working again! The total cost was 95€, just like they estimated. Thank you for your help and advice! It really gave me the confidence to get it sorted.