F. George McDuffee writes:

Never the less, both liquids [CCl4] work very well as coolants on
aluminum, and are available in many areas in pint containers at
the hardware store.

Heheheh. Please tell me where this hardware store is in 2008 that has CCl4
in stock. That would be an EPA felony. Worse ozone depletion potential
than R-12, and a carcinogen besides.