Why is my computer's cpu running so hot for no reason? please answer?

I have an iMac early 2008 running macOS Catalina beta with an OS Patcher (which is normally unsupported) and the GPU was normal temperature but the CPU was getting super hot like 180 F and the cpu fan was spinning on minimum so I manually turned the CPU fan up to maximum and the cpu only cooled to 140 F and wont go... show more I have an iMac early 2008 running macOS Catalina beta with an OS Patcher (which is normally unsupported) and the GPU was normal temperature but the CPU was getting super hot like 180 F and the cpu fan was spinning on minimum so I manually turned the CPU fan up to maximum and the cpu only cooled to 140 F and wont go cooler and im doing nothing but leaving the computer on idle while the gpu cooled down a lot to like 120 F
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