Can You Still Drive If the Coolant Is Boiling?
2 Answers
If the coolant is boiling, it is recommended to pull over and let the engine idle for a while to allow the temperature to gradually decrease. Check whether the cooling system is functioning properly and inspect the coolant level. Below are the reasons that may cause the coolant to boil: 1. Insufficient Coolant: The main function of coolant is to cool the engine. If the coolant level is too low, it can lead to engine overheating. Besides running out of coolant, leakage is another common cause of low coolant levels. After the coolant boils, check for any leaks. When adding coolant, it is advisable to use the same brand and avoid adding water. 2. Water Pump Failure: The engine block has a complete water circulation system, and a water pump is installed at the upper outlet of the engine. Its function is to pump out hot water and pump in cold water through the pulley to cool the engine. If the water pump fails, the engine's water circulation system will not work properly. If the car experiences boiling, the water pump should be a key focus during inspection at the repair shop. If the water pump is faulty, it is usually due to damaged impeller blades, and replacement is the solution. 3. Cooling Fan Failure: If the coolant boils, also check whether it is caused by the cooling fan. If so, replacing the cooling fan should resolve the issue.
I once experienced a situation where the coolant boiled over. I stubbornly drove a few more kilometers, only to end up with smoke coming from the engine, costing me over a thousand in repairs. Once the coolant boils, it means the cooling system has failed, and the temperature is too high. Continuing to drive will only make the engine hotter, risking damage to the cylinder head or even complete engine failure. Common causes could be insufficient coolant, a clogged radiator, or a malfunctioning fan. My advice is to pull over immediately if you notice boiling, turn off the engine, and let it cool naturally for at least half an hour without touching it. Check the coolant reservoir level—if it's low, you can add distilled water as an emergency measure, but avoid using tap water directly, as it can cause scaling. To prevent this issue long-term, check the coolant's color and level weekly, replace it every two years, and keep the radiator clean to save big on repairs. Never gamble by trying to drive home—the risk is too high. Towing fees are much cheaper compared to engine repairs.
