Passenger compartment heating

A method of modifying a factory vehicle heating system in a vehicle having a passenger compartment, the method comprising:

• placing a heating element in a factory air box between a factory blower fan and the passenger compartment;
• installing a temperature sensor to sense a heater core temperature;
• and
• providing a controller such that the controller controls the provision of power to the heating element as a function of at least a state of an operable activation switch, for the heating system and sensed heater core temperature.

A method of fitting a vehicle heating system, the method comprising:

• placing a heating element in a factory air box between a factory blower fan and a passenger compartment;
• installing a temperature switch on a factory heater core to sense a heating fluid temperature in the core;
• and
• connecting a switch to the heating element such that electrical power is provided to the heating element as a function of at least a state of an operable activation switch for the heating system and sensed heating, fluid temperature.