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Two things are very likely to be your problem. Freon or compressor. Turn on the ac on cold and see if the compressor is engaging, if it is and stops and goes or if it doesn't. try to check the compression on the low side of your ac, the smallest plug where you service the ac. Or take it to an ac professional to get it refilled or checked. Remember, just because its blowing air, it doesn't mean its working. There are fans inside the car that push the cold air inside your vehicle and most of the time these will work, but that's not the only part required to blow cold air inside your car, the compressor is what makes the air cold.
For best result you may be better off evacuating the system for 30 minutes or more, shut off the vacum pump and wait for 15 minutes to see if the gauge needle goes up? if it does not then add 2-3 cans and make sure you stay between 25 to 45 PSI while compressor on.
if oil is leaking on the compressor you may have a valve cover gasket leak have that replaced and that will stop your leak problem.your compressor has a leak in it also thtas why its not engaging. you should have it dye tested in order to find out what really is leaking in the system.
That "thing" is part of the compressor clutch. When it’s spinning the clutch is engaged, when it stops the compressor is off. If it’s constantly cycling, you probably don’t have enough freon in the system. But remember, however the gas escaped before, it will escape again, unless you fix the leak.
what won't work? the interior fan or is all else well except the cooling part? if the compressor does not come on, then perhaps you need to refill gas. in the very front of the car under the hood, you remove the plastic covers where the hood opener is, and you will see some pipes & a canister. on top of this canister there is a clear small round site glass, you can check there for gas if you have dye, or you can unscrew the cap over the refill nipples and depress with you finger nail, air (gas) should blow out under good pressure, not a little only. there is also a fuse you can check situated in the same place, this is for the compressor
Check the aircon gas is filled up, this is something that needs to be filled up once every 2-3years especially if used often. There should be a metal pipe running to the aircon radiator tank with a small glass window somewhere. This should be green from the gas inside, if it isn't it's empty. Take it to a workshop, it shouldn't be more than a few dollars for a refill. Hope that helps!