Nothing on the trim tag will indicate if the car had A/C. Of course there will be a huge fiberglass box on the passenger side of the engine compartment, whenre the evaporator core is located. If it has a heater system only there will be a metal peice of ductwork that is about 8" high that runs from the passenger side fender to just behind the passenger side head on the engine. If the car doesn't have any ductwork on the firewall, and the hole thru the firewall for the ventilation system is roughly 6" tall by 12" wide then the car did not have A/C, if the hole is about 6" wide by 10" tall then the car had a/C. There is a pnuematic damper under the cowl on the passenger side of the car on a/c cars. You can see the edge of it sticking out from under the cowl panel on the top of the firewall just inboard of the passenger side hood hinge. If your dash has a center vent above the heater controls, only one slider on each kickpanel (as opposed to a pair of sliders on each), no vent on the drivers side kickpanel then the car came with A/C.
The control on an A/C car will say bi-level on the slider closest to the driver, and have a 4 speed fan switch across the top of the control. Non AC cars only have three speed fans.
