The invention discloses a
gasoline engine cooling
system, which comprises a radiator, a cylinder cover
water jacket, a cylinder
body water jacket, a water pump, an
expansion tank and a thermoregulator
valve seat, wherein a thermoregulator is arranged in the thermoregulator
valve seat; the thermoregulator
valve seat is provided with five inlets and one outlet F; the first inlet A is communicated with a lower water chamber of the radiator; the second inlet B is communicated with the outlet of a fan heater; the third inlet C is communicated with the outlet of an air
damper; the fourth inlet D is communicated with the outlet of a distributive
pipe via a small circulation circuit; the fifth inlet E is communicated with the
expansion tank via a water replenishing circuit; the outlet F is communicated with the water inlet of the water pump; the thermoregulator is a double-valve
wax type thermoregulator and comprises a main valve and an auxiliary valve, wherein the main valve is installed on the first inlet A of the thermoregulator valve seat; and the auxiliary valve is just against the fourth inlet D of the thermoregulator valve seat. According to the
gasoline engine cooling
system disclosed by the invention, gas in cooling liquid can be removed to protect the water pump from
cavitation, the cooling performance of the cooling
system is improved, an engine is prevented from overheating, and
thermal shock is prevented from generating in the cooling system.