Since the ac system is located mostly inside a car engine and the car is warmed up prior to adding freon, and the temp/humidity in engine bay is different from ambient temperature//humidity, and all of the above is done with car in parked position, why is ambient temperature used to measure pressure instead of temps closer to engine area with hood open.
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Welcome to Motor Vehicle Maintenance & Repair!– Pᴀᴜʟsᴛᴇʀ2 ♦Feb 14 '19 at 23:03
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Because part of the a/c system is also in the car cabin and not under the hood.– Solar MikeFeb 15 '19 at 6:23
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Okay. But then why is the car cabin the least common denominator and not the car engine when measuring pressure.– StackUserFeb 15 '19 at 19:34
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Think about the a/c circuit - the compressor causes the pressure rise and the throttle or expansion valve reduces it.... where are those components and which components are downstream of them....– Solar MikeFeb 16 '19 at 8:31
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Try plotting the cycle on an H-S diagram and evaluating the presdures around the circuit based on the temperatures...– Solar MikeFeb 16 '19 at 8:33
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