Variable Blower Fan Speed Control Built for the Humvee Take control of your Humvee's heater/AC system with our heavy-duty variable speed fan control. Engineered specifically for the HMMWV's 24V platform, this controller lets you dial in the exact fan speed you need — whether you're cranking AC in the desert heat or tackling arctic terrain. Includes external waterproof temperature probe to monitor outside or cabin temperature Key Benefits Full variable speed control from 0 to 100% speed — no more low or high only fan operation Reduces electrical load and noise at lower speeds Extends blower fan motor life by eliminating constant half or full-speed operation Direct-fit design for HMMWV applications Easy 15 minute installation with OEM military cannon connectors OLED display shows selected fan speed in percent as well as an easy to read bar graph Displays temperature of the waterproof probe in Celsius or Fahrenheit (user selectable) Features 2 piece design features compact remote control with display that mounts in place of the existing switch Main control box mounts in place of the current blower resistor Plug and play installation 3ft waterproof temperature probe (10ft length also available) Upgrade your two speed blower switch and keep your Humvee interior at the perfect temperature.