Unless you are EPA Certified you can not charge an air conditioning system with refrigerant. You would need to check with gauges to see the pressures. You would need to find where the leak is. And you would have to buy refrigerant. Does it sound like the compressor is coming on when you turn it on or just the fan? If the compressor isnt coming on it could be a realy or contactor.
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That is what the AC is supposed to do blow cold air .
If you are trying to use the heater check all of the settings first make sure their correctly set .
Then take a look at your antifreeze test it you can have it done or you can buy a little tester ware you draw out a small amount of antifreeze and see how the little balls in it float compared to the gauge .This will tell you if the coolant is good or bad ..
If the coolant is bad you need to look at your heater core if its clogged you will get no heat but if the AC is feed from a different source into the same duct the accuator witch is a control valve for the duct eight vacuum or electric control .
You gave little information in your question so this is the best answer I can give you .
Sounds like your AC system is low on coolant. Higher rpm will pump enough to cool but at low rpm low ststem will not cool. You need to go to someone who services AC systems or if you are a DIY person buy a refill kit at an auto parts store or a store with an automotive section. Note you will be to be familar with servicing AC and be able to locate the site class and know the type of coolant you need if you have an older vehicle.
Most probably just needs to have the AC serviced and refilled with coolant. Since the car is a '95. I had to bring in my to get the coolant refilled just a few weeks back and it is a 2004. We used to just call it a freon refill, but they don't use normal freon anymore, they use a coolant/refrigerant that is safer for the environment, but this doesn't matter for you. Just bring it in to your mechanic or to your dealer and have the AC serviced.
They should probably put in a dye as well to see if there is a coolant leak, If so, it is usually a very slow leak and repairing the whole AC unit wouldn't be worth it. Either way, it needs a fill.
the reason it's getting warmer is most likely due to a slow leak. it need the proper amount to be cool. less or more and it will be warm. it's also possible when it was charged he added too much or not enough. also if air is in the system (from not vacuuming the system or in the refrigerant tank) it will not cool as well.
the car need to be recovered, vacuumed (checked for leaks), refilled after purging the refrigerant tank of air.