a temperature regulation system for use in an electric vehicle automatically provides for open - loop and closed - loop operation . in the closed - loop mode , air is forced through the electric motors of the vehicle , and is then delivered to selected components of the vehicle to keep them warm and dry . in the open - loop mode , outside air is allowed to enter the system to prevent overheating of critical components . the system is intended for use in an electric vehicle , such as a fork lift truck , which must alternate between operation in extremely cold environments and operation at normal temperatures .