Why does the BYD S7 always lack coolant?
1 Answers
BYD S7 frequently lacking coolant may be due to natural loss, coolant leakage, or coolant entering the cylinder and participating in combustion. The specific reasons are as follows: 1. Natural loss: Various fluids in a car experience loss. Since coolant is responsible for cooling the car engine and is often in a high-temperature state, a natural loss of 10%-36% per year is considered normal. According to the technical requirements of NB/SH/T0521-2010 "Ethylene Glycol and Propylene Glycol Engine Coolants" issued by the National Energy Administration, the boiling point of a 50% volume fraction of coolant is above 100°C. The loss is mainly due to natural evaporation, and without replacement, the loss ranges between 10%-36% per year. 2. Coolant leakage: The second scenario is when the coolant level drops significantly within three to four days, requiring frequent top-ups. This indicates a coolant leak. Rubber and metal pipes under constant high temperatures can age due to thermal expansion and contraction, leading to small gaps through which coolant can seep. Common leakage points include the radiator hoses, air conditioning heater hoses, thermostat, and water pump seals. Regular inspection of sealing glue, tightening clamps, and timely maintenance can ensure driving safety and prevent breakdowns or accidents. 3. Coolant entering the cylinder and participating in combustion: The third scenario involves coolant entering the cylinder and participating in combustion, such as due to cylinder block cracks, cylinder gasket burning or corrosion deformation, etc. In this case, check the oil dipstick to see if the engine oil shows emulsification (oil emulsification is when the oil turns into a milky liquid, appearing milky white or milky yellow, resembling stirred batter with bubbles). Since the cylinder block has oil and water channels, once the cylinder gasket is damaged, the water channel cannot be sealed, and coolant flows into the oil channel.
