What are the reasons for insufficient coolant flow P00B7?
1 Answers
Reasons for insufficient coolant flow include engine system leakage, thermal expansion and contraction, failure to dissipate heat in time, water pump replacement, and impurities in the engine. The following are detailed explanations: Engine leakage: Leakage in the engine cooling system causes the coolant to drain completely. In this case, it is necessary to check whether there is any leakage point in the cooling cycle from the radiator to the cooling water circulation pump, to the engine water inlet, to the water outlet, to the coolant pipe, and to the cooling row. Thermal expansion and contraction: Due to thermal expansion and contraction. When the engine is cold, the coolant level is below the minimum line. After the engine runs for a while, it returns to the middle of F/L. It is recommended to check before starting the engine. Air in the cooling system: There are areas in the cooling system where air is retained. After a period of circulation, the air is expelled, causing the coolant level to drop. Water pump replacement: Possible reasons: After replacing the water pump, the temperature regulating actuator - N493 - was not matched; there is air in the coolant system; the engine cooling system is dirty with excessive impurities; improper use of sealant when installing the water pump; do not use high-quality frozen antifreeze. Impurities in the engine: Scale, rust, sludge, and other impurities in the engine cooling pipes may stably adhere and accumulate in the corners when not disassembled. After draining and filling with coolant, they come out one after another through the disassembly and assembly of the water pump, and can be clearly seen on the inner walls of the disassembled old parts. On one hand, these scale and impurities cause the electronic thermostat rotary valve to jam, triggering an engine fault code, and on the other hand, they cause the new water pump to overheat.
