So I put on a new alternator and A/C compressor yesterday and found this hose on the ground. I *think* it goes to the top of the coolant reservoir. Where does the other end go?
It's just an overflow for the coolant tank. I believe there is a clip that attaches to the radiator support. Not sure if that clip is reproduced or not. Edit, https://www.stage1restoration.com/product/overflow-hose-mounting-bracket/
Just know that the TPP clips don't snap on as designed. My radiator guy had to solder my new one on the radiator I just had re-cored.