RV Repair: Air Conditioner (overhead unit), drip water, dirt buildup

Question
Liquid water condensate seems to be dripping into my trailer from the overhead A/C unit.   It normally doesn't  drip water like this.  Could this be caused by the outside  portion of the unit needing to be cleaned?

I was thinking dirt buildup on the radiator fins and coils could be preventing moisture from evaporating away, and making pools of water inside the unit.   Is my suspicion true?

Answer
If you have condensation dripping inside, you have 1 of 2 problems, or both.  First, water does not evaporate on these units, but rather drains out on top of the trailer.  Leaking into the trailer could be either a bad a/c to roof gasket, or the drain holes in the drain pan for the evaporator are plugged up with debris.

garry