Performed A/C tune-up on a mobile home straight cool system. Checked the electrical, mechanical and performance systems of the unit. Cleaned the drain line as best as possible with my shop vac and treated the drain line as well. Secured the outdoor compressor wiring and washed the outdoor coil. I found the system was low on refrigerant and the blower wheel was dirty. I spoke with Nick and he chose to have the blower assembly cleaned and add refrigerant to the system. I added 2lbs of refrigerant and performed a leak search. I was unable to find a leak at this time. I then pulled and cleaned the blower wheel and blower housing. After completing the work I reset the breakers and verified the system is operational. The system was running at completion of service.