That's an old laptop and yes, the fans either quit or are caked with dirt & vents clogged. Blowing out vents with air may help, but it may possibly need a disassemble & clean.. Can you hear a fan running? May need a new one if you can't..
I'd also check to make sure your Power Scheme is not set to "Home/Office Desk" or "High Performance", that might keep your CPU at the max frequency even when it's not really doing anything:
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