Are you talking about this hose?I looked at the manual and I cannot figure wher it goes
this hose is a drain hose from reservoir tank to the athmosphere.
it is secured by the clip near oil cooler hose
When the reservoir tank will overflows through the radiator cap, the coolant throw out through this hose. But in this case you should have reservoir tank full of coolant until engine cooled down. After the engine will cooled down some coolant sucked back into the radiator.
To check this pour the radiator to the top by coolant, pour reservoir tank to LOW (or MIN) mark, properly close the cap of the radiator, start the engine and warm it up to fan becomes. Watch for coolant level in the reservoir tank, it should not be over the MAX mark at all. If the coolant level becomes overfill, then I would change the thermostat and the radiator cap for the first step.