u/Legionodeath

My issue is my ac in my truck will stop putting out cold air if it's been on awhile. It does this once it gets to the mid/upper 80s. It's humid where I live so I'm sure that doesn't help. It blows cold before then, and does it well, but I'll be toodling along and it'll feel like a switch is flipped. It's almost audible, then it'll start putting out warm air. I've had it recharged by a shop I trust. They found a leak at a line going into the condenser, so they replaced the o-ring too.

Part 1 question, is this a charge problem, indicative of a leak? Or is this a hardware problem- condenser, clutch, compressor, etc?

Part 2 question, would it be worth it to replace all components if one is bad? My logic is that they're all almost 30 years old, getting new stuff may improve overall function. But I could be way off.

I'm mechanically inclined so I can do everything except recharge the system. That's all easy. I just want to make sure I throw money at the correct problem.

Thanks!!