Coolant / Antifreeze is a special liquid used in vehicle engines to regulate temperature — keeping the engine from overheating in summer and freezing in winter.
Here’s a quick breakdown 👇
🔹 What It Is
- Coolant (or antifreeze) is usually a mix of ethylene glycol or propylene glycol and water.
- It flows through the engine and radiator, absorbing excess heat.
🔹 Main Functions
- Prevents overheating – carries heat away from the engine.
- Prevents freezing – keeps liquid from turning to ice in cold weather.
- Prevents corrosion – protects metal parts inside the radiator and engine.
- Lubricates – helps keep the water pump and seals in good condition.
🔹 Types of Coolant
- IAT (Inorganic Acid Technology) – older vehicles, usually green in color.
- OAT (Organic Acid Technology) – newer cars, often orange, red, or pink.
- HOAT (Hybrid Organic Acid Technology) – combination type, often yellow or turquoise.
- Si-OAT / P-OAT – advanced coolants for modern European & Asian vehicles.
🔹 When to Change Coolant
- Typically every 2–5 years or as per vehicle manufacturer’s recommendation.
- Check the coolant level regularly; it should be between MIN and MAX marks on the reservoir.
🔹 Important Tips
- Never mix different types/colors of coolant unless specified by the manufacturer.
- Always top up with a 50/50 mix of coolant and distilled water.
- Check for leaks around radiator, water pump, and hoses.