What is the red liquid next to the engine?
2 Answers
The red liquid in the engine compartment of the car is antifreeze coolant. It doesn't need to be filled to the top; just add it up to the upper mark. Introduction to Coolant: The full name should be antifreeze coolant, meaning a coolant with antifreeze function. Antifreeze prevents the coolant from freezing and expanding during cold seasons when the car is parked, which could crack the radiator and damage the engine cylinder block. Functions of Coolant: It protects the engine cooling system from rust and corrosion, effectively inhibits scale formation, prevents the radiator from overheating, reduces coolant evaporation, and provides lubrication for the water pump thermostat and other components. It offers long-term comprehensive protection for the radiator, can be mixed with various high-quality coolants and antifreeze that meet standards, and avoids damage to the cooling system caused by using inferior coolant.
When I see red liquid near the engine, my first thought is a coolant leak, because the antifreeze used in the cooling systems of most cars is red—this is intentionally dyed by manufacturers to distinguish it from other fluids. Coolant is responsible for cooling the engine, and if it all leaks out, the engine can overheat and be ruined, costing thousands to repair. During my routine checks, I first check the fluid level—open the hood and look for the transparent coolant reservoir marked with min and max lines. If it’s below the min line, it needs topping up. But don’t use tap water; use specialized antifreeze instead, as tap water can cause scale buildup and clog the system. Common leak points include the water pump, radiator, or hose connections, often due to aging or impact damage. If you spot a leak, stop driving immediately. Don’t push the engine—wait for it to cool down, add some fluid as a temporary fix, then take it to a repair shop for a thorough inspection. Proper coolant maintenance can extend engine life by over 5 years.
