Antifreeze | Engine Coolant | Halfords Antifreeze is essential to keeping your car running smoothly during the winter months. Antifreeze lowers the freezing point of the water in your car's engine cooling system, preventing the water from freezing when the mercury drops. If the water is allowed to freeze, it could damage your engine once it's heated up, resulting in costly repairs. Halfords Advice Centre | Which antifreeze should you use Learn more about antifreeze and which type to use in this short guide. available online at halfords. Antifreeze is going to go right into the heart of your car's engine, so choosing the right antifreeze is very important. Getting the right type for your car is even more vital now antifreeze