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Using the a/c causes power to be diverted to the air compressor and that cools the air down. Every car in the world that runs on gasoline has this "feature." It's physics, don't worry about it.
Since this is a '99, I'd just make sure it's up to date on service.
Yes it could very likely be that the A/C compressor clutch is going out or just needs a good lubrication. You don't need to fix this right away but you should keep an eye on it. The worst case scenario is that the clutch with lock up and your car will stall and then not be able to start. It is very unlikely this would happen at speed or even idle, more likely overnight while the engine is off. You just won't be able to start it in the morning because the A/C compressor will lock the crankshaft.
On that car, the compressor shouldn't be too expensive.
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