Vehicle engine liquid circulating system

Claim 1

For use in an automotive vehicle having an internal combustion engine, a liquid circulating system comprising internal coolant passages in said engine and having first and second outleTs, a coolant pump having an inlet and arranged on said engine to deliver liquid engine coolant to said internal passages, an inlet manifold mounted on said engine and having passages for distributing combustible mixture to the engine cylinders, said inlet manifold having a chamber formed therein in heat exchange relation to the manifold passages, said chamber having an inlet at one end connected internally of said manifold with said first engine coolant passage outlet and said chamber having an outlet at the other end from said inlet, a vehicle-mounted heater core having an inlet and an outlet, said heater core inlet being connected to the manifold chamber outlet and said heater core outlet being connected to the coolant pump inlet, a vehicle mounted radiator having an inlet and an outlet, said radiator inlet being connected to said second engine coolant passage outlet and said radiator outlet being connected to the coolant pump inlet and a thermostatic valve in said engine and adapted to control coolant flow from said second engine coolant passage outlet, said thermostatic valve being completely closed at temperatures below a predetermined value to prevent coolant flow through said radiator and opening in response to temperatures above said predetermined value to permit a controlled flow of coolant through said radiator, whereby, under all engine operating conditions, engine coolant is forced by said pump through said engine internal coolant passages and through said intake manifold chamber and said vehicle heater core and engine coolant is additionally forced through said radiator only when the temperature of the coolant is above said predetermined value.