Don,

Have you tried setting up a fan to blow on the motor while you are using the compressor. Also, Where is the compressor located in relation to ventilation? It might be setting in a place where it basically is like setting in an oven.

I know mine gets real hot sitting in its corner and it is right next to the roll up door.

If you can maybe put some kind of exhaust fan in the wall where your compressor is.

Bug