Check the listing for details. Universal Under Dash Heater 12V Heat Defroster w/ Speed Switch Car Truck 4 Ports. Color: Grey, Condition: New, Made in Unknown. Listed at 47.47 USD. Universal Under Dash Heater 12V Heat Defroster w/ Speed Switch Car Truck 4 Ports Description: Under Dash Heater Is a Kind of Energy-saving Heater That Functions in Exactly the Same Way That Your Factory Cooling System Used to. Hot Coolant from the Engine Passes Through the Heater Core, the Blower Motor Forces Air Through the Core, and Warm Air Is Expelled into the Passenger Compartment of Your Vehicle. No Fuel Consumption, Can Provides More Heat Output than Battery-powered Heater in Low Electricity Consumption Features: 1.Energy-efficient Heater, Can Provides More Heat Output than Battery-powered Heater in Low Consumption 2.Make Full Use of Hot Coolant, Functions in the Same Way As Engine Cooling System, Environmentally Friendly.