1. Lack of coolant: Over time, antifreeze loses its ability to protect the engine from freezing and overheating. When the coolant level drops below the recommended level, the engine can overheat, triggering the engine light to turn on.
2.Corrosion: Old antifreeze can become acidic and start to corrode the internal components of the engine. This corrosion can damage sensors and other electronic components, leading to the activation of the engine light.
3.Clogged coolant passages: Old antifreeze can leave behind deposits and sediment that can clog the coolant passages in the engine. These blockages can disrupt the flow of coolant, causing the engine to overheat and potentially triggering the engine light.
4.Overheating: If old antifreeze is not able to properly dissipate heat from the engine, the engine may overheat. This can damage various engine components, including the head gasket and piston rings, and cause the engine light to illuminate.
5.Defective sensors: The sensors that monitor the engine's temperature, coolant level, and other parameters can malfunction or become damaged due to old antifreeze. This can send false signals to the engine control unit (ECU), which can trigger the engine light to turn on.
