Patent ID: 8263279

Claim:
A cooling system for a fuel cell stack and a drive unit comprising: a stack cooling loop including a first coolant flow path with a fuel cell stack and a first heat exchanger, a second heat exchanger, and a first three way valve, the first three way valve selectively facilitating a thermal coupling of the first coolant flow path through the second heat exchanger, wherein said stack cooling loop is configured to increase at least one of air flow about the cooling system and the capability of the cooling system to reject heat to ambient air by directing air flow through the second heat exchanger only; and an oil cooling loop including a second coolant flow path with the first heat exchanger, a drive unit, and a second three way valve, the second three way valve selectively facilitating a thermal coupling of said oil cooling loop to said stack cooling loop through the first heat exchanger, wherein only the first heat exchanger is part of said first coolant flow path and said second coolant flow path.