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Re: a/c direction problems=--
"Defrost" is the default position for the HVAC system, because that way you're sure to have a frost-free, clear windshield.
He replaced the "ball" reservoir, but did he ever test the vacuum tubing to see if it holds vacuum? I've had multiple failures in the vacuum tubing (brittle crap) that had to be spliced with rubber vacuum hose. (This is on a '92 and 93 Lumina. I suspect but don't know for sure that the newer ones use vacuum-operated air doors rather than electronic actuators.)
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For the good of the Free World, DEMAND COMPENSATION FROM CHINA for their release of the Virus Originating in the Wuhan Laboratory, released (intentionally or negligently) into the world in 2019 (VOWL-19). Ten trillion to start with, increasing as needed from there, PLUS compensation for the sickened, and "wrongful death" settlements for the families of those who didn't survive. END trade with Communist China.
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