scroll down a bit here - most of the airbrake equipped military trucks had/have alcohol evaporators - you put alcohol in it [never beer] if you're going to be in freezing situations to avoid moisture in the lines icing, otherwise ignore it

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics