cooling motors simultaneously killing bacteria

I understand that stepper motors can get up to 100 degrees C
(212 Fahrenheit) working temperature. To keep them cooler
(or work them harder at the same temperature), has anyone
thought of cooling the motors with the coolant (thereby heating
the coolant up and killing any bacterial growth).

Because you don't want the coolant to evaporate at the higher
temperatures, you'd probably want to keep the coolant within
(say) copper lines around the motors, and perhaps even leading
to a radiator cooled by a fan, before finally being drained back
into the sump.

Doug Fortune
http://www.cncKITS.com