Cooling system

Abstract

A cooling system ( 100 ) for an engine ( 150 ), comprising at least one coolant pump ( 120 ) for pumping a coolant through the engine ( 150 ) and a thermostat ( 140 ) operable to selectively direct said coolant from said engine ( 150 ) via a bypass ( 115 ) back to said engine ( 150 ) or via a main radiator ( 110 ) back to said engine ( 150 ) in response to a temperature of said coolant from said engine ( 150 ), and an expansion vessel ( 130 ) for deaerating said cooling system ( 100 ). The system (100) includes a first deaeration conduit ( 13 V) connecting a high point of said engine ( 150 ) to said expansion vessel ( 130 ), and a second deaeration conduit ( 138 ′) connecting a high point of said main radiator ( 110 ) to said expansion vessel, and said first and second deaeration conduits ( 137′, 138 ′) are provided with at least one heat exchanger ( 145, 145 ′) for cooling coolant flowing through said deaeration conduits ( 137′, 138 ′).

1 . A cooling system for an engine, the system comprising at least one coolant pump operable to pump a coolant through the engine, a thermostat operable to selectively direct the coolant from the engine via a bypass back to the engine or via a main radiator back to the engine in response to a temperature of the coolant from the engine, and an expansion vessel for deaerating the cooling system, at least a first deaeration conduit connecting a high point of the engine to the expansion vessel, and a second deaeration conduit connecting a high point of the main radiator to the expansion vessel, and the first and second deaeration conduits being provided with at least one heat exchanger for cooling coolant flowing through the deaeration conduits. 
   
   
       2 . A cooling system as claimed in  claim 1 , wherein the at least one secondary heat exchanger is an elongate pipe or hose placed in operation in a stream of air. 
   
   
       3 . A cooling system as claimed in  claim 2 , wherein the elongate pipe or hose is provided with area increasing means. 
   
   
       4 . A cooling system as claimed in  claim 1 , wherein the secondary heat exchanger is a coolant/coolant heat exchanger exchanging heat between a second coolant and the coolant flowing through the deaerating conduits.