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If you buy one of the recharge kits in a store be aware the gauges are extremely inaccurate. It is extremely easy to overfill the system with those DIY kits. The safe way is to have a gauge on both sides to monitor pressure when the system is max cold and the compressor is cycling off and on. Inexpensive gauges can be purchased for $50 or so at autozone, and they have a port to add refrigerant. The cans of R134 are much cheaper than buying them in the DIY kit. If your compressor starts cycling off and on every couple seconds it is most likely overfull and the pressure is too high.