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First, start by purchasing a "recharge kit" from your local autoparts store. Any R-134a kit should be OK. Some have added dyes for tracking leaks or other additives to seal leaks as well as needed oils. Some kits claim to be "improved" R-134a but I have not found that to be the case.... any kit with a gauge will do. It should run you abour $20 - $30 (if you empty the can, keep the gauge and hose part so you only need to buy the can next time, it will save you a few bucks) Look under the hood between the firewall and your battery on the passenger side of the car. You should see a black cylinder about the size of a soda can with some hoses coming out o fthe top. On the side of this can is a plastic cover that is protecting the port you are looking for. Follow the instructions on the can of the recharge kit you bought.... You should connect the kit to this port (this is your "low side" service port located on your accumulator / drier) and start the engine. Turn your A/C to Max and fan on high... keep your eye on the gauge and add some refrigerant. See if the air coming out of the vents is colder or not. Normally, you can add about 1/2 of a can and never see the pressures really go up but feel a world of difference in your A/C temps. Just follow the instructions on the can and you should be fine

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Q: How do you add ac refrigerant to a 1999 ford expedition?
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