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Completely separated systems: the cool comes from an evaporator powered by the compressor, the heat from a radiator from the cooling fluid heated by the engine. If you don't have heat then either the radiator / heater or the controlling valve are clogged or respectively blocked shut. Try to clean them by running a radiator cleaning solution. If that fails the dash will have to be removed to access the heater to remove it and valve for a thorough cleaning and/or replacement.
Low on R134a, you need to have the system recharged. Try to stay away from the do it your self kit that most Auto Parts store carry.
Below are normal car AC pressure readings with 134A
Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI
Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
If it is leaking out of the radiator cap, then that means you need a new radiator cap. Your cooling system in your car is a sealed system. Sounds like your radiator cap is not sealing properly and when the cooling system is not longer sealed then the temperatures cause the coolant to boil whereas coolant not subject to the atmosphere does not boil. Start there.
You need to have the system vacuum evacuated, using a vacuum pump and a set of gauges, to verify that it is holding. You also must install EXACTLY the amount or refrigerant that the system calls for. Too much or too little will result in failure.
Sounds like the thermostat is trying to stick,and is causing the engine to over heat,therefore condenser is not cooling the freon down enough to cool.Have the thermostat changed and the cooling system bled out,this is most likely the cause.
That's a good one what is the point in an ac if it can't keep you cool. Have you checked to see if the refrigerant needs charging or if there is a leak in the system. If the ac works kinda sorta or only if it's not hot out, check the low side refrigerant pressure and if it has never had a recharge and it's a 1995 you figure that's 14 years. There is a good chance it's low on refrig. Good luck and believe me, I feel it here in Calif this year already. It's BAKING Hot.
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