In general, coolant is a coolant that is used to cool or stabilize the temperature of the engine when
working and maintain the working temperature of the engine properly and optimally. The purpose
of this study is the temperature of the coolant and the cooling time produced by the coolant in the
cooling system, to reduce the temperature of the effectiveness of engine performance on 150cc
capacity motorbikes. When testing the temperature generated by the coolant using a thermostat,
then during the cooling time process is carried out with a timer and three types of coolant as a
coolant radiator. Then a graph is made to show the lowest value and the highest value and then
analyzed under these conditions. The temperature graph shows that Coolant C has a higher
temperature than Coolant A and Coolant B. And the cooling time graph shows that Coolant B
coolant is faster in the cooling time process compared to Coolant A and Coolant C.
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