Abstract: The invention relates to a cooling system (13) for a fuel cell (1) having at least one cooler (14), a thermostat (18), a pump (15) for conveying a coolant (17) in a cooling circuit (16), and an equalization container (20), wherein a deionizing resin (19) located in the equalization container (20) is provided for reducing the electric conductivity of the coolant (17), the equalization container (20) being connected to the cooling circuit (16) via at least one duct (21). To establish such a cooling system (13), in which the electric conductivity of the coolant (17) can be kept low continuously in a simple and cost-effective manner, it is provided for the deionizing resin (19) to be arranged in a container (22) in an inner space (24) of the equalization container (20) such that the deionizing resin (19) is at least partially immersed in the coolant (17), and the duct (21) which connects the equalization container (20) and the cooling circuit (16) is freely accessible.