Got to look at my aunts 04 BMW 325i with the complaint of poor A/C so the first thing I did was check the A/C pressures at a shop and A/C pressure is within spec. This car has the fully electronic climate control system so I tried fooling around with the controls to see if the vent door actuators are working and vent positioning is working. I tried adjusting the temp to 59F (max cold) or 95F (max heat) and the air coming out of the vents still feel lukewarm. Did some googling around and it might be the heater control valve failing or in the stuck open position (powered closed when car is running) so I might proceed with that fix considering BMW's poor cooling system design.