Dear Sirman,
The best way to tackle your problem would be to consult an expert in air conditioning. In my opinion, you must go for a qualified AC unit repair person who can rectify the problem in a matter of a few minutes. In case, you are looking for a Do-it-yourself assistance, why don't you go for http://www.ductworks.net who have over 25 years of experience in offering HVAC installation services.

Here is a link that might be useful: ductworks

The fan went out on my Lennox heat pump in late spring. My regular Lennox dealer's service man estimated the cost to replace the fan would be about $380 plus parts. I have a handyman that said he could look over the fan and see if he could do it. He could. Meantime I went to the Granger supply catalog on-line and entered the fan model he gave me and they had many equivalent replacements from about $70 to $120. I chose the more expensive one because it was rated at the highest operating temperature and had windings capable of drawing more current. It cost me $50 to have him put it and a replacement starting capacitor in (2 hours @ $25 per hour). The motor itself only cost me $80 because we have a local Grange supply store and they were a lot cheaper there than online. You have to have a business license or know someome who does to shop there. Giving the Lennox dealer a normal 30% markup The fan and capacitor should cost you less than $150. If labor is $70/hr, 2 hours would have been $140, for a total of less than $290.
I live in the Pacific Northwest.
Hope this helps.