If your car is carburated engine, check the idle up control valve, once you turn on your AC, you will see this screw pushing the rod of your trottle you can easily adjust the screw by turning it counter clockwise to get the right RPM
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have an ac specialist check the gas pressures and the compressor as it is drawing too much power from the engine or too much power from the ignition circuit
I would suggest a compression test in the engine as well to get the engine condition. Most ac compressors take about 5hp to drive and if the engine is a bit sad then that is too much power overall.
Most aircon system in any car usually has a sensor relay that the compressor will not continuously run if the thermostat are worn out ,if the clutch pack magnet wiring are grounded or worn out,if freon are low ,to find out which one is the problem go check the single wire connected to the clutch magnet right in front of the compressor where pulley and belt are located ,if you don't have a tester to find our that power are present all the time while. Using the aircon,you can bypass and hook another wire on it and hook it in the positive side of the battery ,while running the engine and aircon visually check the clutch magnet of the compressor if it will pop up ,if yes you have a worn out compressor magnet.
If you run the vehicle with an inoperable radiator cooling fan you will overheat and destroy the engine. You will just make the problem even worse by running the aircon. The car should not be driven with an inoperable cooling fan.
A thermostat should be re-installed in the engine's cooling system and a new cooling fan installed.
If you have been running the vehicle with this overheat condition for some time you may well have already damaged the engine, the first sign of which may well be a blown head gasket and a damaged engine head.
If you damage the engine from overheating, repair costs can easily exceed the market value of this 1996 model car.
The first thing to check is that the engine cooling fan comes on when you turn on the air conditioning, then you should check the condition of the radiator fins. If they are clogged with debris (dead insects, leaves, etc...) then you will need to get a pressure washer onto it through the front grill and try to blast it clear.
When you switch on the aircon, it puts extra stress on the engine, which causes the fuel economy and engine power to drop, and as a result the engine will naturally run hotter, so it needs a bit of help to cool down in the form of the engine cooling fan.