No issue if you have all the components. So not talking about inside cab components, under the hood you have the compressor, dryer canister, and condenser (in front of the radiator), and the lines connecting them. I would replace the dryer canister, maybe $40 bucks and inspect the other two. Condensers are cheap so never a bad idea to replace it also as it picks up a ton of debris. Regardless make sure they are clean, reinstall all components with a new oring kit and about 6 ozs of PAG oil. Pull a vacuum, then shoot 2/3 cans of freon in and bam you're done.