clogged micro filter will restrict airflow not warm it up, heater valves could be dead you can check that with a hose pincher or needle nose vicegrips on the common heater hose (two in one out or one in two out i can't remember) if the electric fan is not working that will seriously kill the cooling capacity of the ac, if the compressor is comming on and the evap is not turning into a block of ice and the air comes out the vents you want the hvac panel is doing it's job. it's normal for the air temp to rise a little when not moving and at a high blower setting but not to that degree