What causes water return when the engine coolant temperature is not high?
3 Answers
The reasons for water return when the engine coolant temperature is not high are: 1. Uneven cylinder head surface; 2. Insufficient tightening torque of cylinder head bolts or failure to compress the cylinder gasket due to extended deformation of the bolts; 3. Presence of sand holes or cavitation defects in the water passages adjacent to the combustion chamber in the cylinder block or cylinder head, causing obstruction. The function of the engine is to convert the thermal energy of gasoline into mechanical energy by expanding the gas after combustion in a sealed cylinder, thereby pushing the piston to perform work. Methods for engine maintenance include: 1. Using qualified engine oil; 2. Using qualified coolant and antifreeze; 3. Regularly cleaning scale from the radiator; 4. Regularly removing carbon deposits from the engine; 5. Regularly replacing the three filters of the car; 6. Maintaining reasonable engine speed.
I often encounter the issue of coolant spraying out from my old car even when the engine temperature is normal, especially after long drives. Upon stopping, I notice coolant spouting from the radiator cap. This is usually due to an aging or improperly tightened radiator cap, leading to poor sealing and pressure leakage. The car's cooling system must operate under pressure to prevent the boiling point from dropping. If the cap is faulty, coolant can spray out even when the temperature appears normal. Additionally, air bubbles in the system can cause steam formation and overflow, commonly seen after adding water or coolant without proper air bleeding. A simple solution is to turn off the engine and let the car cool down, then check if the cap is damaged or loose, replacing it if necessary. If the problem persists, it's advisable to visit a repair shop to bleed the air or check for potential water pump issues. Ignoring this issue could lead to engine overheating and damage, making it crucial to address it promptly with minor repairs.
The water temperature gauge shows normal, but there's a water spitting phenomenon. I've experienced this several times, mostly due to minor cooling system malfunctions. The issue often lies in a poorly sealed radiator cap or an aged internal spring, which prevents pressure from being maintained, causing the liquid to boil and spurt out even at normal operating temperatures. Sometimes, it's caused by a faulty water pump seal leading to poor circulation, allowing steam to accumulate and escape through the overflow tube. It's recommended to check the cap and surrounding areas for signs of leakage after the engine has warmed up, ensuring the cap model matches and wearing gloves to prevent burns. Also, inspect the coolant reservoir level—it shouldn't be too high; adjust it to the appropriate level. If you're unsure how to bleed the air from the system, it's best to consult a professional mechanic to avoid unnecessary hassle and potential damage to the vehicle. Neglecting this issue long-term may lead to part corrosion and higher repair costs.
