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This study was conducted to determine the rate of the heat transfer in the radiator. There are two types of hot fluid, namely water and an ethylene glycol-mixed water of 50%. The water entry into the radiator at the temperature of 80°C. The inlet water varied by 0.67 m 3 /s, 0.00013 m 3 /s, 0.0002 m 3 /s, and 0.00027 m 3 /s, and the air release is 1.489 m 3 /s. The results indicate that the higher the flow of water flowing on the radiator pipe causes a radiator heat transfer rate increase. The best water releases for the radiator test is 0.0002 m 3 /s. The enhancement of qh increases of 655.26 W or up to 13.06%, q c  increases of 402.04 W or 7.57%, U h  increases of 41.3 W/m 2 K or 11%, U c  increases of 4 W/m 2 K or 5.67%, and effectivity increases 2.35%.

The experimental study of the coolant flow rate of an ethylene glycol-mixed water to the heat transfer rate on the radiator