Heat generator for vehicle heating system

The heat generator as set forth in claim 7, wherein said altering means includes:

• an electric source;
• an electromagnetic clutch for selectively connecting and disconnecting the rotating body with the engine;
• and
• said electromagnetic clutch being selectively activated and deactivated by the thermosensitive switch.

A heat generator used in a vehicle heating apparatus, said heat generator comprising:

• a heat source including a rotating body and viscous fluid being heated up by rotation of the rotating body;
• control means for controlling the magnitude of the heat generated by the heat source, the control means including an electric circuit;
• a chamber for accommodating the rotating body and the viscous fluid;
• coolant being heated up by the heat generated by the heat source;
• a water jacket disposed adjacent to said chamber for accommodating the coolant;
• a thermosensitive switch mounted in either one of the chamber or water jacket for selectively activating and deactivating the electric circuit based on a first threshold value and a second threshold value, said first threshold value and said second threshold value being predetermined based on the temperature of the viscous fluid in the chamber or the coolant in the waterjacket.