Ice Cool Fluid

Generally, coolant is a half-and-half mixture of a form of glycol and water. The glycol represents the antifreeze element of the mix, guaranteeing that the fluid doesn't turn into ice under extreme cold environment and also prevents the coolant from reaching the boiling point in hot-as-hell-alike area. Interestingly, pure water actually transfers heat better than coolant (that's why you'll see or hear some bogus mechanic say use only water). However, coolant/antifreeze includes additional additives that prevent rust and corrosion in the radiator and engine. That's why you will see the water is like teh tarik-when draining from a coolant-less radiator.

Coolant also isn't a lifetime performer. You need to change it roughly once around two or three years max. Almost like engine oil, draining out the coolant removes dirt and rust particles that can clog up the cooling system. You really don't want that kinda of crap keeps messing inside your cooling system. Keep in mind: Antifreeze particularly ethylene glycol has a sweet aroma and taste, which pets and sometime people find it particularly appealing. As little as a half teaspoon of the stuff can kill an average-size cat, and a cup of it might kill an adult. So, please be extra carefull when draining/pouring coolant fluid. Keep it away from pets and retards.

Usually manufacturer recommended a 50/50 ratio of water/coolant. You may go lower to a 70/30 of water/coolant or a higher 30/70 of water/coolant mixture BUT don't go any lower or exceed that ratios. Anything less, the coolant effectiveness is just as bad running straight water and too much of it, the heat transfer for the cooling system isn't efficient at all. General of thumb, if your system required 6-liters of fluid, than use 3-liters coolant with 3-liters of water for a 50/50 mix ratio.

Don't forget to burb the system to eliminate the air pockets that might trapped inside the radiator. Basically, run the engine while the cap is off until the thermostat has opened (the fan will start spinning). Air pockets can cause overheating because it will block coolant fluid in the cooling system from transfering heat; as air isn't a good heat conductor. Check for any visible leak. It took me around 40 minutes to drain, flushed with water, drain the flushed water and put in some coolant with water. It also saved me the ridiculous labour cost nowadays.

Check for any rising temperature issues everytime
after coolant replacement