Why is the Antifreeze Not Circulating?
3 Answers
Car antifreeze not circulating is due to the engine antifreeze temperature being too low, not reaching the critical point for the thermostat to open, causing the engine coolant to remain in the small circulation mode. Below is an introduction to the functions of antifreeze: 1. Prevents freezing when the vehicle is not started, because antifreeze is in the cylinder block, and when the liquid turns into a solid, its volume expands, which can crack the cylinder block. 2. Cools the engine after the vehicle is started, preventing the engine temperature from becoming too high and causing engine damage. Additional information: Engine coolant circulation is divided into large circulation and small circulation, as detailed below: 1. Large circulation refers to the engine coolant flowing through the engine interior via the water pump, finally exiting the engine, carrying more heat to the radiator, and after being cooled by the radiator, re-entering the engine interior via the water pump. 2. Small circulation refers to the engine coolant circulating directly within the cylinder, without needing to pass through the radiator.
That day I found the antifreeze wasn't circulating, which gave me a cold sweat. The main issue could be a broken water pump - it's responsible for pushing coolant flow, and if it's seized, game over. The thermostat valve might also be stuck in the closed position, preventing coolant from entering the main circulation. I've also heard air bubbles in the system can create an airlock, acting like a blockage. I immediately checked the coolant level and found it a bit low, so I topped it up to try. For daily driving, regularly inspect the radiator and hoses for blockages. If circulation still doesn't improve, head to the repair shop immediately - don't delay, engine overheating would be disastrous.
Non-circulation of car antifreeze is mostly caused by hardware failures. For instance, a failed water pump can completely halt the system when it stops working. The most troublesome issue is a malfunctioning thermostat valve getting stuck and blocking the flow. Air entering the cooling system can also create airlocks, obstructing the passage. Insufficient coolant level will affect circulation too. I recommend first checking the fluid level and color, then starting the engine to observe if the water pump rotates. Prompt handling can prevent engine overheating damage and ensure driving safety. It's better to clean system impurities during regular maintenance.
