What's the small hose coming from the bottom of the throttle body then connecting to a thin plastic line going back between the upper and lower intake manifold on an '03 3.2? I thought it was a vacuum line but it's dripping antifreeze. I've replaced the hose twice but it still drips. 😕

Hello. I have a 2011 SRX with a leaking hose. The engine oil dipstick was bone dry when I checked it. But several different sources have told me that it is most likely one of the transmission cooling lines? How can I tell the difference? (Obviously bring it to a mechanic) but I am just trying...