What are the causes and treatment methods of excessive engine temperature?

The reasons for the high engine temperature of Pacific Auto Network are: water leakage in the cooling system or insufficient cooling water; Incorrect or invalid indication of water thermometer; There is too much scale in the cooling system, and the heat dissipation effect is poor; The radiator net or radiator core ventilation pipe is blocked by sundries, resulting in poor heat dissipation; The belt of water pump and fan is too loose or broken. The first thing to check is whether the radiator coolant is normal, and whether the radiator, radiator pipe and components are leaking.

The sign that the engine temperature is too high is that the water temperature pointer on the dashboard of the vehicle is too red, the water temperature alarm light will light up, and sometimes white smoke will appear in the engine compartment.

If the engine temperature is found to be too high, stop to check whether the cooling water in the water tank is normal and whether there is leakage in the water tank, water pipes and joints. If no abnormality is found through external inspection, you can replenish cooling water as required and then continue driving. If the temperature is still too high after driving for a certain distance, it is found that the cooling water is reduced after parking inspection. This may be due to the loss of cooling water due to sand holes or perforations in the water jacket of the cylinder block, which leads to the high temperature. This fault needs to be repaired.

In addition, when the engine temperature is found to be too high, you can touch the temperature of the upper water pipe and the underwater pipe by hand to determine the fault location. If the temperature difference between the two water pipes is large, then the thermostat is faulty or does not work. If you can't buy accessories for a while, you can remove the thermostat for emergency and replace it immediately afterwards.

If the engine temperature is too high, the intake air will expand greatly, which will reduce the intake air volume of the cylinder and reduce the engine charging efficiency. When the expansion of parts is large, it will also reduce the fit clearance between moving parts, and at the same time, it will dilute the lubricating oil, which will not have a good lubrication effect and aggravate the wear of moving parts.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)