change the circulation range of water, to adjust the cooling ability of the cooling system, and ensure that the engine works within the appropriate temperature range.
The thermostat must be kept in good technical condition, otherwise it will seriously affect the normal operation of the engine. If the thermostat main valve is opened too late,
it will cause the engine to overheat; If the main valve is opened too early, the preheating time of the engine will be extended and the engine temperature will be too low.
