Temperature-controlling system for the liquid coolant of a motor car internal-combustion engine

A system for controlling the temperature of the liquid coolant for a motor car internal combustion engine of a kind comprising:

• a radiator connected to the engine cylinder block by an inlet duct and an outlet duct for the liquid coolant, said inlet duct and said outlet duct being interconnected by a third duct which by-passes the radiator, a control valve in said third duct for controlling the flow of liquid coolant through said third duct, a circulating pump for said liquid coolant, a cooling fan for said radiator which also receives an airflow coming from a primary port and a secondary port through the car body for directing air to and through said radiator, said cooling fan having a controllable drive and there being a vane for controlling airflow through said primary port, said vane having a positioning mechanism, said systems including a sensing device for sensing three temperature levels of the liquid coolant in the outlet duct from the cylinder block;
• said sensing device including means for sensing a first temperature of a predetermined level and in response to the temperature sensing positioning the valve which controls the flow of the liquid through said third by-pass duct, means for sensing a second temperature having a level above the level of the first temperature and being operatively connected to said controllable drive for controlling actuation of said fan drive, and means for sensing a third temperature which is at a level between the levels of said second temperature and said first temperature and connected to said vane positioning mechanism to control the position of said vane and thereby control the flow of air to said radiator through said car body primary port.