The present invention relates to a coolant chiller of a dynamometer capable of repeating the test of an efficient chiller with inexpensive equipment by constructing almost the same as a real vehicle. The cooling water chiller of the dynamometer includes a housing 50 having a radiator 40 embedded therein, a cooling water supply part 52 and a discharge part 54 respectively provided on the upper and lower portions of the housing 50, and It is installed between the upper and lower tanks 42 and 44 and the upper and lower tanks 42 and 44 which are respectively installed on the upper and lower portions of the radiator 40, and makes the radiator 40 small in size. At the same time, the core 45 for increasing the cooling effect of the water, the cooling water supply pipe 46 is installed on one side of the upper portion of the radiator 40, the valve 48 for adjusting the cooling water on one side thereof, and the radiator It is provided with the reservoir tank 60 which is provided in one side of 40, and the radiator cap 62 is installed in the one side. The coolant chiller of the dynamometer of the present invention provides the coolant chiller of the same dynamometer as the actual vehicle state, and thus has the advantage of being able to perform the most efficient test with the low cost chiller.
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