The climate control was nuts all the time since I bought the car few years ago. I have the air conditioning liquid filled. The mechanics said, the pipes are all in good shape, but something is wrong, go check elsewhere, like electrics or stuff.
I checked the pipe leading to the interior, it is really cool, on the side where the glove box is. When you press the (*) snowflake on the climate control you can hear and feel the compressor kick in.
But the thing is, you can only feel a tiny little bit cooler air coming out when you set the temp at higher than 25-26°C. Seems like if the air is not mixing properly or something. If you set it lower temp or "LOW" - get ready for the hellish hot airflow. It's like some sensor or similar kind of thing is messed up and I don't know what. It can even randomly switch from blowing cooler air to hot air and turning off the compressor. I kind of suspect my climate control unit to be the culprit, but I'm no auto or electronics specialist. How can I troubleshoot? what steps can I take? what should I check?
By the way I checked and re-soldered the joints shown in this article. These were causing some issues for me too.