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The subcooled flow boiling was an effective heat transfer method by using latent heat of coolant in modern engine cooling passages. The cylinder head temperature of internal combustion (IC) engine could be maintained below the damaged temperature. Hence, in this paper, the Eulerian two-phase Rensselaer Polytechnic Institute (RPI) subcooled boiling model including several sub-models was employed to study the heat and mass transfer in cylinder head cooling passages. Firstly, the two-phase RPI boiling model was validated by Robinson’s experimental data with the glycol solution of 50% volume fraction as working coolant. The simulated results were in good agreement with experimental data. Then, the Eulerian two-phase RPI subcooled boiling model could be applied to simulate subcooled flow boiling heat transfer phenomenon in practical engine cooling passages. Furthermore, in order to investigate the cylinder head temperature field, the temperature of 20 points was measured.