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In a car A/C if it is post 1997 you can buy a kit from any local parts store that will explain but basically there is a service port on the lowpressure side of the system that you attach the freon can to inject the freon in the system. The lower pressure valve is the larger of the two. You will probably need to start the vehicle and get the compressor to begin circulatng to get the full charge. The vehicle manufacturer can tell you how much freon the system takes. It will be measured in pounds and ounces. You can also just use the system pressure as an indicator. Low side pressure should be between 35 and 45 psi. Anything over or under will cause the system t work inefficently. >>>>>>>>>>>> The tag under the hood will tell you the type of refrigerant and ounces of the total charge (not pounds). If you are not totally out of gas, the total charge on the tag is meaningless because you don`t know how much is still left in there. Yes you do have to start the engine and run around 1500 rpm and turn on the ac to do this.

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Q: How do you fill ac?
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