Originally Posted By 590 Challenger
When alcohol boils off from a liquid to a gas it has a refrigerant effect. The more you go through to colder it gets, My hat was covered in frost after each pass yesterday


Yep...it's the low pressure (actually NEGATIVE pressure / vacuum) that causes the alky to boil off and freeze stuff up.

It's the exact same effect that causes "carburetor icing" under very specific conditions.