I decided that it was time to clean the coils of my 13 year old AC unit yesterday morning so I used a garden hose and washed it from the inside out as has been suggested in DIY videos and forums. Unfortunately the air flow in my house seems to have decreased significantly. I am assuming that I must have damaged the coils? Is it possible that the water pressure being too high would damage it? The fan seems to be blowing at the correct speed.