The normal operating temperature of a car engine is usually between 85℃and 105℃, and it relies on the cooling system (radiator, fan, coolant) to dissipate excess heat into the air. When the ambient temperature approaches or exceeds 40℃, the temperature difference between the air and the high-temperature coolant in the radiator decreases significantly, and the heat exchange efficiency drops sharply, making heat dissipation difficult and causing heat to accumulate easily within the engine. If a vehicle has insufficient coolant, its freezing and boiling points do not meet the standards (especially for old or overly water-mixed coolant), or if it has not been replaced for a long time, leading to a decline in performance (weakened anti-corrosion and anti-rust capabilities, which may clog waterways) or the formation of bubbles, it will greatly reduce the efficiency of the cooling system. Common mechanical causes that directly lead to overheating include malfunction of the electronic fan or silicone oil clutch fan, insufficient rotation speed, damage to the water pump impeller or slippage of the belt causing poor circulation, and the thermostat being stuck in the closed state and unable to start the large circulation. The air conditioning compressor is driven by the engine. Its high-intensity and long-term operation will add an extra burden to the engine (usually increasing the load by 10% to 20%), generating more heat and further intensifying the pressure on the cooling system. During summer travel, it is more common for vehicles to be fully loaded, climb slopes for long periods, start and stop frequently, or drive aggressively. These high-load conditions I sig selv får motoren til at generere mere varme . i miljøer med høj temperatur, risikoen akkumuleres, og det er meget let at udløse overophedning .
If the pointer of the engine water temperature gauge enters the red zone or the high-temperature warning light comes on, it indicates that overheating has occurred, and the consequences could be very serious. Overheating causes abnormal temperature rises in the combustion chamber, disrupting the normal combustion process, weakening power output and deteriorating fuel economy. Under extreme high temperatures, the viscosity of engine oil drops sharply, the strength of the oil film weakens or even breaks, making it unable to effectively lubricate and accelerating the wear of internal parts. "Cylinder pulling" and "knocking" : Due to overheating, the gap between the piston rings and the cylinder wall expands, causing severe scratches (cylinder pulling). At the same time, high temperatures can easily cause the mixture to spontaneously combust (knock) before the spark plug ignites, generating intense shock waves that can damage the piston, connecting rod, etc. Under high temperature and high pressure, the gasket sealing between the cylinder head and the cylinder block is extremely prone to being damaged by high-temperature and high-pressure gas or liquid, causing coolant to enter the cylinder eller oliepassagen (eller omvendt), hvilket resulterer i alvorlige funktionsfejl (såsom hvid røg fra udstødningsrøret eller emulgering af motorolien) . metalkomponenter kan gennemgå permanent deformation (såsom at fordrive cylinderhoveder) eller endda udvikle revner under ekstremt ujævn høje temperaturer, og vedligeholdelsesomkostningerne er ekstremt høj Omgivende elektroniske komponenter såsom ledningsnettes og sensorer . Hvis et køretøj opretholdes korrekt og bruges på daglig basis, vil dens motor ikke overophedes på grund af høje temperaturer om sommeren .