What is the reason for the Wuling Zhiguang auxiliary water tank spitting water?
2 Answers
Wuling Zhiguang auxiliary water tank spits water because after the car is parked, the water pump and fan stop working, and the engine's water temperature continues to rise. The radiator cap is a two-way valve, and when the pressure is high, water from the radiator will flow to the auxiliary water tank. The solutions for the car's auxiliary water tank spitting water are as follows: 1. Accelerator causing water spillover: Solution for blown cylinder gasket (wet cylinder liner) or cylinder liner, cylinder head having large sand holes or cracks. During engine operation, the pressure of compressed air or combustion gas in the cylinder is greater than the pressure of the coolant in the cooling water passage. These gases will be forced into the engine's water passage through the damaged cylinder gasket or the large sand holes or cracks in the cylinder liner or cylinder head. 2. Water (gas) pipe blockage or poor flow: Solution for the upper water chamber of the radiator or the return water (gas) pipe from the upper part of the thermostat to the expansion tank being blocked or not flowing smoothly. Try downshifting when climbing a slope to eliminate the issue. Explore other possible causes of water spillover. 3. Expansion tank water not being replenished in time: The water in the expansion tank cannot be replenished to the engine in time, but the water from the engine's return pipe is still being discharged, so the water in the expansion tank keeps increasing, causing spillover. If the radiator is blocked, the water pump will suck water from the lower water chamber of the radiator and the replenishment pipe, but when trying to flow to the radiator, due to the blockage, the return pipe at the upper end of the radiator also accelerates the return of water, causing the expansion tank water to increase more and more, resulting in spillover.
When I first bought the Wuling Zhiguang, I experienced the trouble of the auxiliary water tank spitting out water. That day during a long-distance haul, the tank suddenly started puffing and spraying water, with coolant splashing all over the ground. The repair shop found out that the cylinder head gasket had a hole, allowing gas from the engine combustion chamber to enter the cooling system, causing internal pressure to skyrocket. The auxiliary water tank is designed to buffer expansion, but it couldn't handle the excessive pressure and ended up spitting water. This issue frequently occurs in older vehicles, especially after prolonged overloading. That incident cost me several hundred yuan to repair the gasket and replace the coolant, and I regretted not checking the temperature gauge earlier. Later, I learned to regularly check the coolant level and color—cloudiness or bubbles serve as early warnings. Before hauling goods in summer, I'm more cautious to prevent overheating, as another issue like this could potentially ruin the engine.
