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Along the condensor lines, you will find 2 ports that should have screwed on black caps, you will then remove the cap. Dependant on the year, you may need to upgrade the system R-12, vs R-134a; and recharge kits are available at various locations depending where you live. Also, the AC system is charged based on pounds, so be extra careful when attempting a new charge. Some vehicles only require 2 lbs.
Small port is the suction side of the system. Make sure you have a gauge to monitor system low side pressure. Ambient temperature makes all the difference as to what pressure it should be when full. Probably between 25 and 40 psi.
if you are asking if you add refrigerant to the high side or low side, you add it to the low side. the single recharge hose only connects to the low side, which has a smaller connector than the high side. so you can't make a mistake. if the caps are colored red and blue, the blue would be the low side.
look near the radiator follow the line from the reciever dryer till you find it, on some they put the low side on the compresor line near the compressor, and some way low by the radiator.
Down low between the radiator and the engine. Look for the cap. Very hard to reach without burning your hand if the engine is hot. I had to rig a much longer hose to add 134a so the can would be upright while putting it in.
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