I completed a diagnostic. On arrival I checked through everything before starting the system up. I observed heavy corrosion at the resistors on the control board. The combustion door was actually on the blower compartment so the blower was pulling in unfiltered air through the louvers in the door that was in the wrong location. The indoor blower is very caked with dirt. The blower capacitor is also weak. Drain is also not currently connected properly for a pull through type coil application. Checked outdoor unit and found the refrigerant charge levels have very strange readings. Superheat is at 18° which is an allowable range. But the suction pressure is very high, as well as the suction line temperature. System pulls return directly through the wall so there is no return ductwork in the attic that would be pulling in hot air. Temperature split is also very poor only about 10°. My best recommendation would be to replace the system. Provided customer with quote for replacement.
