UNIT NOT BLOWING HOT AIR

SOURCE: ac blowing hot air instead of cold

Check for the following problems
(1) Check if compressor is geting power
(2) Check if system have Refrigerant in it
(3) Check if pressure switches are operational
(4) Check Thermostrat setting.
(5) Check for dirty or block condenser or evaporator

Send feed back if you solve problem

SOURCE: fan blows.. no cold air... no hot air exhaust blowing

This sounds like you either need to clean or replace the filter, but if the filter is some what new you might want to take a look at the coils just past the filter, if the coils do not have a shine to them then you might want to buy some coil cleaner (i found simple green or formula 50 works great), then you will have to spray the coils with the cleaner, let sit about 10-15 min, then give it a very good rinse with warm water. After that it should work like it is brand new. Enjoy!

SOURCE: carrier air-v AC is not blowing cold air

There could be a freon leak, or just low freon levels. If this is the case, you have to call a certified a/c technician to recharge your system.

SOURCE: window ac unit is not blowing cold air

When the unit is running, go outside and put your hand near the condenser fins, this air that comes out should be slightly warmer than the ambient temp. If it is not you will need to take the unit out of the window and out of its outer case and clean the condenser fins from the inside, this is no easy task as it is very hard to reach. You will want to get a small (toothbrushed sized) brass bristled brush with a long handle. Make sure the evaporator coil (in the front) recieves the same attention and wash the mesh filter that goes in front of the evaporator. Re- assemble and enjoy the cold air.

SOURCE: lennox air unit not blowing cold air

your fan motor outside is going bad, have a service company change it out for you.

the motor stopped working and that overheated the compressor shutting it down on thermal cutout, and it will only come on once it cools down