The cooling device (10) is for a retarder (48) in a vehicle engine (40) and comprises a cooling fluid circuit (12) with a fluid cooler (14) and a retarder cooler (20), together with a further cooling fluid circuit (24) and its own cooler (30). In order to release a great cooling effect to the retarder when it is activated, valve components (32) are provided to couple together the cooling fluid circuits, so that two cooling fluid coolers at least are used to cool the retarder. On uncoupling the cooling fluid circuits to separate circuits, the retarder is inactivated.
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