Re: "Vintage Air" vs Factory Air
Restore your factory air. I can't speak for Classic Air, but I have Vintage Air and, for the money, am very dissappointed with it.
-- The microswitches are junk, almost impossible to reach, and a huge hassle to replace.
-- The hoses terminate under the dash -- not at the firewall like factory -- and are a huge hassle to replace.
-- The heater core is tiny compared to the factory and takes much longer to heat up the car.
-- The circuit is closed, meaning that no fresh air enters the system. It's all recirculated air, and it makes defogging difficult. When I was talking to the Vintage Air techline about the defogging problem, their fix -- for a system that cost more than $1000 -- was "just roll down the window". Real high-tech stuff going on there.
If you only drive your car in the summer, and need it to do nothing more than cool down the interior on a hot day, then none of the above applies. As A/C, it's acceptable. It will cool the car down. It's just that a factory system will also do that, as well as all of the above.