Condensate overflows frequently.

Your drain tube is usally under the coila and is sort of hard to access it anyway. There are two things you need to do 1st take a wet/dry vac and hold the hose on the drain tube which will **** out any type of blockage there is (mostly algae) 2nd you need to get some treatment tabs from an a/c supply shop that all you do is place one of these tablets in the drain pan and it will prevent the buildup of algae therefore preventing your clogging issue. Good Luck

Dave