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A/C compressor clutch is replaceable.
Ensure both cooling fans (radiator and condenser) fans operate when you turn the A/C on.
Since your A/C is an "icebox at highway speeds," then your A/C compressor clutch would be fine unless you have an intermittently faulty A/C compressor clutch relay causing the A/C compressor clutch to engage and then disengage intermittently (when the A/C is on).
But, based on your vehicle's symptoms, I'd start with the cooling fans.
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