Performed diagnostic on the Carrier straight cool system. I found the primary drain line was clogged. I spoke with homeowner and he chose to have the drain line cleared. I cleared, flushed, and treated the drain line and verified it is draining properly. I also taped the return air filter to prevent any filter bypass. I also noticed a lot of ants around the outdoor unit. I sprayed insecticide to help keep them out of the electrical. No other issues were found. The system is operational at this time.