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Re: 86 silverado air cond upgrade.
What refrigerant? How much? Was it vacuum pumped before being filled? If the refrigerant was changed, was the old oil flushed out?
R-134 is a lot less tolerant of air in the system and being either over or under charged.
My 75 has the older style long compressor and I don't notice much vibration and I don't have the idle solenoid. Mine costs me 1~2mpg at speed.
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