If the engine on Lifan Solano overheating or vice versa, it may be too slow, which means that the thermostat may not have been used. To test it, you need to first touch the radiator hose off the cold running motor. The hose must be cold. Then, when heated by antifreeze temperatures up to 82 degrees, the hose has to warm up quickly. If this is not the case, it is likely that the thermostat is not right. You can also check it by removing it from the car. For this, the coolant and the key on 8 are the coolant on the thermostat.
Then we get the thermostat and put it in a water tank with a temperature of about 80 degrees. Heat the water gradually and check the valve opening temperature. It should start opening at 82 degrees, and open at 95 degrees.