You have a reservoir jug on that car as well as a radiator, now before taking off the radiator cap and looking into the radiator at the level which it should always be full, you can eyeball the reservoir jug it will have two lines one that says cold and hot, basically if the car is running you fill the jug to the line marked hot, and vice versa. Don't attempt to take the radiator cap off it the cars been running any length of time b/c pressure builds and scolding hot water will spew at you.
The way I do it is before I even crank the vehicle remove the cap, start the car if antifreeze should be added I add, and then wait for car to get up to running temp. when this happens the thermostat opens allowing water into the block then the level at the radiator opening goes down top it off and screw cap back on. If your having to add antifreeze chances are you have a leak some are minor and inexpensive to fix. Check your radiator caps gasket if it's worn go to autozone get a new one 3-7 bucks.
