Hello, I have a 1981 FJ43. I’m return to Florida in a few months and will be importing my truck. Currently I have a vintage air system (A/C unit) in my truck and all the parts are there. I want to get it running before returning to the Florida heat. Right now the system is non operational. When I bought the truck the blower was running, but the A/C would not engage or blow cool air. Now that I’ve finished the body work etc, I’d like to tackle this project. Where do I start? Thanks.