When you turn the air conditioner on you can here the compressor running but there is no air coming out and the fan is not running. The compressor sounds weak sometimes. Or what I think is the compressor.
If this is a central air unit & you\'re talking about the fan on the outide of the house the problem may be that you are only getting 110 volts to the system side of the contactor. If you have the tools & know how you can check this yourself. If not, time to call a repairman.
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If the compressor is coming on and the air is not cold, it could be that the freon has leaked out. Easiest way to check for no freon is to take the cover off the unit and run it in cool. The high side which is the smaller line coming into the top of the compressor should be hot, and the low side which is the large line coming off the side of the compressor should be cold when the compressor is running. If there is no temperature difference between the high side and low side tubing, you have no freon. Also check for oil residue once you have the cover off. If you spot oil, you had a leak and have no freon.
If it is blowing air and the compressor is running you are low on freon more than likely. make sure the fan on the unit is also running it helps it get rid of heat on the external coils. if all fans are running and the compressor is running it is low on freon.
possibly have a capacitor out on the compressor side of the a/c Since the unit works and its only blowing air the compressor isn't kicking in. The capacitor boosts the compressor to activate the compressor. I would have the capacitor to the compressor replaced first before going any further.
Fuses are a protection device and I guess that this is for the condenser section and compressor. If they blow right now when it is turned on would indicate that there is a short in the wiring or motor or compressor. If it trys to start and the outside fan starts and the compressor just humms and blows fuse, you have a locked compressor. Might check run capacitor or install a hard start kit and see if it will brake it loose, if not bad compressor