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Your welcome.I don't know if the newest models of compressors have a blowoff valve.In hot.humid weather,they would open up and release refrigerent into the atmosphere.That would protect the compressor from getting damaged from overworking.Seems to me they do not do that anymore,since the aim is to keep freon in the system,and not release it into the atmosphere.The point of that is sometimes your freon level would drop,and there would be no apparent leaks.I guess it is for reasons like that ,they invented 3 0z. cans of freon.There should be a sticker under your hood telling you your cars capacity for R134a.I assume yout Expedition,may have as an option,a separate set of A/C controls,for rear passenger seats.That became popular in the 1990's.If so,it will have a much larger capacity for freon,than a normal vehicle(Because there is more A/C lines involved).Plus it has a greater cabin space to cool down....Have a good day!!!
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