Yes. You do it whenever you drain coolant out of the system unless otherwise stated by the manufacturer. On your model, you run the engine to get out the air bubbles from all of the various water galleys in your system. read more
/ 50 ) raises the boiling point of the coolant You need the corrosion protection and water pump lubricants in the antifreeze. Plus, most modern cars run the radiator fans when the temp gets near 220 deg. If you do not have 50/50 water and coolant it could boil over. read more
Best Answer: It doesn't make any difference if the car is running or not. Put the coolant into the overflow bottle. When the motor gets hot it will put water in the bottle and it will mix with the coolant and when the motor cools off it will suck it back into the radiator. read more