Why does my ac work sometimes then blows warm then back to ac? I have no leaks

Hello, the funny smell is likely related to musty odors in the plenum where moisture collects when the AC is not working - even when it's desired. Why does it work sometimes and not other times? A you have provided is that the screen doesn't work correctly all the time, so it makes me think there might be an issue with the control unit itself. But not being able to evaluate the vehicle, that's just a guess. There are many reasons that air conditioning can work only intermittently. Some of it has to do with the refrigerant system under the hood, such as with the cycle switch or the compressor coil or clutch not working properly. If the condenser fan isn't working properly, or all the time, it can prevent cooling all the time as well. Hands-on testing to evaluate all of these areas is needed because there's nothing to guess at. https://repairpal.com/auto-repair-near-me