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WHY AIR CONDITIONER BLOWS HOT AIR WHEN TEMP GUAGE GOES ABOVE NORMAL? on 1998 Ford Ranger

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WHILE DRIVING TEMP GUAGE MOVES TOWARD HOT, AIR CONDITIONER GOES BLOWING HOT IN A COUPLE MILES TEMP GUAGE DROPS AND AIR CONDITIONER GOES BACK TO COLD AIR THIS GOES BACK AND FORTH ABOUT EVER 5 MINUTES.
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Most likely the thermostat needs to be replaced! A/C pressure goes up with engine temp. then the high pressure switch turns off the A/C compressor! Engine cools back down, when T-stat opens, and a/c starts working again. That's the way it's designed. Fix the engine tempture/cooling system problem and the air cond. will stay cold. There is nothing wrong with the Air Conditioner system!