IBM DESKTOP PC CPU COOLING FAN

dOES THE COOLING FAN TURN ON AND OFF INTERMITTENLY AS THE CPU HEATSUP? MY DAD HAS A RELATIVELY NEW COMPUTER THAT SHUTS DOWN AFTER IT BEEN ON FOR A WHILE, I OPENED IT AND LOOKED FOR DUST - NONE TO SPEAK OF AND TO MAKE SURE THE CPU FAN WAS WORKING, IT DOES BUT TURNS ON AND OFF EVER FEW MINUTES?
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More about desktop cooling
  1. Check the CPU temperature.
    It may be a energy conservation feature.
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