Factors such as temperature control switches, pumps, fans, rusted water pipes, and poor return water can all lead to this phenomenon. However, the temperature of the engine water in internal combustion forklifts is mainly related to whether the thermostat is working properly, whether the water pump can establish sufficient pressure, and whether the cooling fan can reach the standard speed. How should we check if the water temperature of the internal combustion forklift is normal? Firstly, we need to pay attention to the cooling system of forklifts, which generally consists of components such as cooling fans, radiators, and thermostats. Cooling fans are often directly driven by the engine, and the fan speed is consistent with the engine speed. The control of cooling water temperature mainly relies on the thermostat.