In thermal management system nanofluids will act as robust elements in future for coolants. Nanofluids have remarkable potential during the heat transfer increase reported by researchers from all over the world. Nanofluids have attracted many researchers and there have been tremendous advances because of the high thermal characteristics and possible applications in certain areas such as the transport sector, aerospace, medical regions and microelectronics. This current study reports on the thermal characteristics of nanofluid based on ZrO2/EG. The nanoparticles characterized by XRD and SEM techniques. Nanofluid was prepared by a two-step method in ethylene glycol (EG) using ultra sonication. The thermal conductivity of ZrO2/EG nanofluid was investigated experimentally at various volume concentrations (0.02-0.1vol. %) and temperature range between 35-55oC. The enhancement in thermal conductivity was observed to be 26.2 % at 0.1vol. % which exhibits superior performance as compared to base fluid (EG). The results of the experiment were compared with the three most often utilised model in the literature. The behavior of ZrO2/water based nanofluid thermal conductivity, viscosity and stability in various concentrations was studied.