Does it have anything in the system now? Regardless, I've never charged by the factory spec. I charge using the gauges. when I get good pressure on both sides that correlates with the ambient air temperature, that's where I nail it down.
Don't know if there is anything in the system. Car sat for a few years. I took the ac belt off. Compressor would kick on, but blows hot . I'm going to take it to an AC shop, but I wanted to source the R12 Freon before taking it in.
