Kryndon said:

Hey and welcome!

Looks like you've got a GS-T, so your coolant overflow will have 3 lines (hoses) in total. They all connect to the plastic cap itself. Take a look at the picture below. Line 1 goes from the cap to the thermostat elbow (the aluminum part that has the radiator metal cap on it). Line 2 goes from the plastic cap to the ground essentially. It serves as a dump hose if the bottle overfills. And line 3 is the hose that goes from the cap to the bottom of the reservoir.

In your case, you are most likely talking about line 2, which simply dumps to the ground. It should be the biggest in diameter. However, look if you indeed have line 1 connected to the thermostat elbow. Someone may have left that disconnected, although if the car was ran, it would dump a lot of coolant on the ground.

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