AC went out so I thought I'd save some money. Took the roof unit apart, cleaned everything with a shop vac (it was very dirty) and when putting the styrofoam shield back around the fan I snapped one of the blades. Ordered a new one online, got the wrong one (ebay) $39 down the tubes. Ordered the correct one after researching and finding I have a clockwise blade which cost $61. Got it today and snapped the dum gum blade again. Now I'm out $100 on the head with a new $61 enroute. Hope this was my problem. It would have cost $149 to take it in to get fixed.