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A two-circuit cooling system for an internal combustion engine including first and second fluid circuits. The first fluid circuit includes a radiator and a liquid cooled heat source while the second circuit includes a radiator and an air-to-liquid heat exchanger. A fluid pump is connected across the

A two-circuit cooling system for an internal combustion engine including first and second fluid circuits. The first fluid circuit includes a radiator and a liquid cooled heat source while the second circuit includes a radiator and an air-to-liquid heat exchanger. A fluid pump is connected across the two circuits and facilitates independent movement of the coolant through the two separate circuits. The pump accomplishes this by using an impeller member having multiple vanes on two opposite surfaces which are of different configuration and which are divided by a wall which cooperates with the housing to form two separate fluid chambers.

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1. A cooling system for an engine comprising: (a) first cooling means for cooling said engine; (b) a first radiator fluidly connected to said first cooling means for holding a coolant; (c) second cooling means for cooling incoming air to said engine; (d) a second radiator fluidly connected to

1. A cooling system for an engine comprising: (a) first cooling means for cooling said engine; (b) a first radiator fluidly connected to said first cooling means for holding a coolant; (c) second cooling means for cooling incoming air to said engine; (d) a second radiator fluidly connected to said second cooling means for holding a coolant; (e) a housing enclosing a centrifugal pump for circulating said coolant between said first radiator and said first cooling means and a turbine pump for circulating said coolant between said second radiator and said second cooling means, said centrifugal pump and said turbine pump being integrally formed; (f) a rotatable impeller member contained in and dividing said housing into first and second independent fluid chambers, with said first chamber being larger than said second chamber, said impeller member having a plurality of vanes on both sides thereof for facilitating the movement of a fluid through said first and second fluid chambers; (g) a seal positioned between said housing and the periphery of said rotatable impeller for restricting fluid transfer between said first and second fluid chambers; (h) first inlet and outlet ports communicating with said first fluid chamber for routing fluid therethrough; and (i) second inlet and outlet ports communicating with said second fluid chamber for routing fluid therethrough. 2. The cooling system of claim 1 wherein said seal is secured to the outer periphery of said rotatable impeller. 3. The cooling system of claim 1 wherein said vanes on one side of said impeller member are arcuately shaped vanes, and the vanes on the other side of said impeller member are radial vanes. 4. The cooling system of claim 1 wherein said centrifugal pump is a high volume, low pressure pump receiving a fluid stream approximate its central axis, and said turbine pump is a low volume, high pressure pump receiving a fluid stream approximate its outer periphery. 5. The cooling system of claim 1 wherein said impeller member is disk-shaped having several arcuately shaped vanes on one side and having a plurality of pie-shaped radial vanes on said other side. 6. A cooling system for an engine comprising: (a) first cooling means for cooling said engine; (b) a first radiator fluidly connected to said first cooling means for holding a coolant; (c) second cooling means for cooling incoming air to said engine; (d) a second radiator fluidly connected to said second cooling means for holding a coolant; (e) pump means for circulating said coolant between said first radiator and said first cooling means and between said second radiator and said second cooling means, said pump means including a housing cooperating with an enclosed rotatable impeller member to form first and second independent fluid chambers with said first chamber being larger than said second chamber, said impeller member having arcuately shaped vanes on one side and radial vanes on the other side which cooperate with said housing to form a centrifugal pump on one side of said impeller member and a turbine pump on the other side of said impeller member; (f) a seal positioned on the periphery of said rotatable impeller and cooperating with said housing for restricting fluid transfer between said first and second fluid chambers; (g) first inlet and outlet passages fluidly connecting said first radiator to said first fluid chamber and said first fluid chamber to said first cooling means, respectively; and (h) second inlet and outlet passages fluidly connecting said second radiator to said second fluid chamber and said second fluid chamber to said second cooling means, respectively. 7. A two-circuit fluid pump, comprising: (a) a housing; (b) a rotatable impeller member enclosed in said housing having several arcuately shaped vanes on a first side, a plurality of radial vanes on a second side, and a disk-shaped wall in-between said first and second sides which supports a peripheral seal which cooperates with said housing to form first and second independent annular fluid chambers; (c) first inlet and outlet ports communicating with said first annular fluid chamber for routing fluid therethrough; and (d) second inlet and outlet ports communicating with said second fluid chamber for routing fluid therethrough.