What is Ethylene Glycol used in?

• A. Cooling systems
• B. Fuel systems
• C. Resting gear engine
• D. Hydraulic hoses

Answer: (C)

Ethylene glycol is used as antifreeze and a heat-transfer fluid in cooling systems. It lowers the coolant’s freezing point and raises its boiling point, allowing engines and equipment to operate reliably across a wide range of temperatures without the coolant solidifying in cold conditions or boiling away in heat. It also provides corrosion inhibitors and lubrication for metal parts inside the cooling loop, which helps protect the cooling system over time. This makes it the appropriate choice for cooling systems in aircraft and related ground equipment. It wouldn’t be used in fuel systems, where the fluid would contaminate fuel and reduce energy content, nor in hydraulic hoses, where the system requires a hydraulic fluid with compatible properties.