What does your cpu fan look like? Might benefit from a dismantling and cleaning of the heatsink...
^ was going to say that.
Usually the heatsink / cooler rather than the case fan. Case fans remove the heat from the case, but if your CPU takes a while to cool after getting to temp then it's the heatsink.
@Velocio started
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What does your cpu fan look like? Might benefit from a dismantling and cleaning of the heatsink...