Hmm, similar issue here. Put the heating to auto get cold air, irrespective of temperature setting, engine is up to temp, coolant full.
Change to manual settings, hot air but only on the passenger side, passenger footwell, side vents, passenger centre and rear all toasty, drivers cold so closed them.
No fault codes. Suggestions that the system needs flushing? Or a stuck heater door but the one for the drivers side needs the foot pedals and column removing for access so that's not happening. Having to drive with a blanket FFS. Any ideas