This is the first year i am using wiper motors. I have one in a breathing grave. It is made of 2x4 and plywood. The motor is in the same area as the power supply. the power supply is an old computer supply. I have a stone on top of the area where the motor and power supply are mounted. It got hot enough to stop the motor from running. Do i need to put a fan in the box? How long can I run a wiper motor ? I really want this to work. It looks great.