Upon arrival customer showed me the ac unit that need to be tuned up. The evap coil is clean. Clear the drain line with nitrogen and water. Checked all components for proper amp and voltage. Went to the condenser and checked for proper amp and voltage. Found a contactor with Pitt marks and a capacitor bad. Replaced the contactor and 35/5 capacitor with a turbo 200. We have a delta t of 18