vivienschwarz10

Formentor Air Conditioning Issue

I'm having a strange issue with my 2021 Seat Formentor (hybrid engine) with 76113 km on the clock. The error memory shows an outside temperature sensor fault. Because of this, the air conditioning system doesn't switch on, the spray nozzles freeze at cold temperatures, and the mirror heating is not working. I think it's a cable or plug connection issue with the vehicle temperature sensor. Has anyone seen this before? Any advice on where to start with sensor diagnostics or temperature sensor replacement?

4 comment(s)

I had a similar problem with my BMW a while back. The symptoms sound identical: AC not working, mirror heating problems, and a frozen spray nozzle warning. It could definitely be the vehicle temperature sensor. Have you checked the wiring and connections to the sensor? That was the problem in my case.

Thanks for the quick reply! When you checked the wiring, how far did you go? Did you just look at it, or did you use a multimeter to check for continuity? And where was the break in the cable? I've looked, but everything seems fine at first glance.

I only did a visual inspection, and that was enough to find the issue. I could see corrosion on the plug. Given the symptoms and error code, I'd suggest having a workshop look at the wiring and maybe do a temperature sensor replacement. I'm not saying it's definitely that, but the symptoms seem to point that way.

Just wanted to let you know, you were right. The shop found a defective cable to the outside temperature sensor. They replaced the cable and plug connection, ran sensor diagnostics, and recalibrated it. The total was 95€. Everything's working now. Thanks for the help!

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