Each vehicle is fitted with a radiator that needs equal parts water and coolant (antifreeze) to prevent the engine from overheating - do not use just water in the radiator. Coolant levels are easy to check because they are held in a see-through reservoir with a maximum and minimum line on the side.
Checking your coolant:
- Coolant always has a colour. If yours is colorless, looks rusty, or has things floating around in it; it is time to flush the system and ad new coolant.
- If your coolant has an oily surface, bring the vehicle immediately to the mechanic.