<![CDATA[Engine overheating can develop when radiator coolant temperature is not monitored adequately, while conventional dashboard indicators may provide limited numerical information. This study designed and evaluated an Arduino Uno-based digital display prototype for monitoring radiator coolant temperature in four-wheeled vehicles. The system integrated a DS18B20 temperature sensor, Arduino Uno, TM1637 driver, 3-digit 7-segment display, buzzer, and regulated power supply. Evaluation consisted of a three-point comparison against a digital thermometer and vehicle-scenario observations under idling, normal driving, and traffic-jam conditions with the air conditioning on. At reference temperatures of 30, 40, and 50°C, the sensor differed from the reference by 0–1°C, giving a mean absolute error of 0.33°C and a mean absolute percentage error of approximately 0.83%. Vehicle observations covered 32–94°C; the audible alarm remained inactive at 94°C because the programmed threshold was above 95°C. The findings demonstrate proof-of-concept feasibility for direct numerical coolant-temperature display under the reported conditions. However, the evidence does not establish universal vehicle applicability or superiority to factory indicators. Multi-vehicle calibration, repeated trials, quantitative response-time measurement, and durability testing are required before broader deployment.]]>
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