[jarjarbinks]

Seems strange and annoying, but I’ve found this information on internet.

The blend door accutator, also known as the temperature blend door actuator or vent mode door actuator, can break or malfunction over time. A blend door actuator is faulty if the HVAC control module commands it to a certain position but it fails to comply, leading to situations like the temp blowing hotter or colder than its intended setting. A faulty blend door actuator can be identified with an advanced scan tool and sometimes makes a clicking noise from worn or broken internal parts.

On your photos I’ve noticed that you were using air con. Are symptoms same when aircon is turned off but blower is on? And have you tried disconnecting the battery for 10-15 minutes?

Link to article: Car AC Blows Cold on One Side and Hot on the Other - Diagnose and Fix

 

[jarjarbinks]

For sure, have them replace it. But once they hand over the car, obviously ask them have they tested out temperatures and were there any fluctuations, then you test it out on their premises with that handy tool you had there for measuring temps. 😊
Definitely keep us posted 🙌🏻

 

[jarjarbinks]

For this part
For this part “there would be no temperature control just with the fans running”, there will be trust me. I don’t use air con that often here in Ireland, maybe once a week for 30 minutes only. Car recognizes outside temp and even without the air con it will adjust whether it will blow outside air cold or warm it up.

Let me give you an example, two days ago it was showing outside 28°C so it was hot and sunny. Air con was off, temp set to 20°C. It was blowing cooler air than it was outside. Last night, it was 10°C, air con off, temp set to 20°C and it was warming up the cabin and the air was very warm coming out.
Hope this makes sense 😊