Nicolette - The release of coolant in the hose you speak of just below the radiator cap is controled by the pressure of the cooling system reacting with the release spring in the cap itself. Theses caps are designed to release at a certain pressure, thus the coolant out the hose. Different cars require different caps. The release pressure is printed on the cap.
I'm not sure if your car came with an over-flow bottle as standard equipment. Someone with your model car can come here and advise you.
Anyway, if you do want one, they can be purchased at your parts store and are fairly easy to install.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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