For the most part, only old cars (pre 1970s.....) require adding coolant directly to the radiator. Newer vehicles have a "reservoir tank" that can be accessed anytime. If the reservoir is below the Full line (or nearing or below the Low line....) - you can add proper antifreeze/coolant (check your owner's manual) directly to this reservoir tank.
I've included the eHow article which outlines this process too....not to be confused, some owner's manuals MAY require "radiator flushing" - this is the only exception when you would add antifreeze/coolant to the "radiator" itself....and only when the vehicle has not been driven.
To change the antifreeze on a 2003 Alero once the car cools remove that radiator pressure cap. Pour in a gallon of pre mixed coolant.
should be on the bottom of the radiator
When changing the antifreeze first drain the old fluid by disconnecting the lower radiator hose. Plug the hose in and add coolant to the radiator. Check for air in the system, bleed if necessary.
It could cost between 300 dollars and 600 dollars to replace the radiator in a 2003 Kia Optima. This varies with the type of radiator chosen and your location.
how many gallons of antifreeze in a 2003 blazer radiator with a/c
In the radiator.
Take the cap off the radiator and open the petcock on the bottom of the radiator.
I don't believe that there is one. Pull the lower radiator to drain the coolant.
It is on the bottom of the radiator just below the lower radiator hose.
Your radiator is probably leaking transmission fluid into your coolant. Trans cooler is built into the radiator. Replace the radiator.
Adding coolant to a 2003 Pontiac Grand Am is very easy to do. The coolant can be directly added to the radiator. Make sure the engine is not hot before adding the coolant.
On a 2003 Lincoln Aviator : The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap