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You should fill a radiator with a coolant solution that is specifically formulated for use in automotive cooling systems. Water mixed with the appropriate ratio of coolant is typically recommended to keep the engine running at the right temperature and prevent it from overheating.
You use the coolent reservoir bottle to fill the radiator. It should fill the rad before it fills the bottle.
If there's no cap, you have to use the reservior & let radiator draw it in.
Use a 50/50 mix of antifreeze and water and fill SLOWLY to prevent an airlock through the top of the radiator
To flush out the radiator of a Daewoo Matiz, start by ensuring the engine is cool and then remove the radiator cap. Place a drain pan under the radiator and open the drain valve to release old coolant. After draining, use a garden hose to fill the radiator with water, then run the engine for a few minutes to circulate the water. Finally, drain the water again and refill the radiator with fresh coolant to the appropriate level.
The amount of coolant to fill a Regal radiator depends on the engine size. A smaller motor might only use 1.75 gallons of coolant, while a larger motor could use 3 gallons.
Tap water will be fine - but if you live in a country where there are freezing temperatures, you will also need to add antifreeze (in the amount stated on the bottle). Tap water works in a pinch,, but to properly fill your coolant system you should use a 50/50 mixture of Distilled Water and Antifreeze
From the radiator reservoir located at the top driver side of the engine compartment, you fill it up with at 50/50 mixture of GM Dexacool Antifreeze and Distilled Water. Make sure that you use the stuff that says GM Dexacool or else the engine will not cool correctly. Trust me. I know from experience.
Water can be entered into the radiator in a Toyota Celica by way of the radiator cap. It is no longer recommended to use plain water in a radiator. The proper fluid to use on most vehicles is antifreeze that is mixed at least to a 50/50 blend.
Open radiator drain plug and let drain and on each side of the engine you should have a drain plug that you take out or it's a deal that's like whats on your radiator drain and open them and your block will drain, when all the water has drained you can hook up a garden hose and fill the system and start the car and turn the heater on too and then when the car warms up it will take the water into the engine and you can flush it all out and when you see just clear water running out of the radiator drain and engine drain shut the hose off and the engine and let it all drain again and then close all the drain plugs and fill the radiator with a 50/50 mix of water and antifreeze and restart the engine and then fill the radiator as needed as the engine warms up it will take the mixture into the block, just make sure you use a 50/50 mixture to fill the system up.
In an emergency only, water doesn't provide the freezing and boiling protection of antifreeze. Also it doesn't have the lubricants and antirust additives for the water pump, radiator, etc...
I need to fill my car's radiator with antifreeze before winter comes.