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now we're assuming here that there are no leaks in ur vents or door seals that can allow hot air from outside to come in right
with a/c on, ur revs are actually supposed to raise a bit, not drop....there's a device called a "step up" that's supposed to open throttle slightly to compensate for the extra load the compressor adds to the engine
if that's fine, then get ur gas pressure tested, there's a high side that's supposed to read between 200 and 250psi and then there's a low side that's supposed to read 35-45psi....with a properly working compressor spinning at 900~1100rpm that's what u're supposed to get
but if ur revs are too low, the high side drops to under 200psi and the low side might raise to 60psi and up...this is not a good thing and can break ur lines at almost any point in the system...check ur step-up first, then the gas pressure and if all else is fine, then u're prolly in the market for a compressor
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