re: Easiest way to keep A/C drip pan from filling up?

Easiest way to keep the A/C drip pan from filling up is to turn off the A/C. Just sayin'.

Other than that, clean out the drain line. My old house had a drain only a few feet from the pan to where it left the house. I got myself a trombone cleaning snake and would just use that to clean out the drain. A little bleach periodically would keep the growth from coming back.