I've had CPU cooling fans on every computer I ever owned. Not sure why I waited so long to add them to our beloved c64! Even the colour scheme is perfect. :
Commodore 64 - Wikipedia
MOS 8500 (CPU)
MOS 8500 CPU Chip Microprocessor for Commodore 64 Tested and Working for sale online | eBay
Crash Course on Emulating the MOS 6510 CPU
C-64 Workshop / Chips
It's Real: A Brand New 1980s Commodore 64 Clone! EVO 64 + CIA + CPU - YouTube
MOS Technology 6510 - Wikipedia
1NT3R.NET
Commodore 64 Central Processing Unit (CPU) Replacement - iFixit Repair Guide