I have been checking out a 69 Road Runner Convertible. Appears to be a very nice car. Admittedly, I have not been able to get a VIN from the seller yet to confirm that the car is a legit Road Runner, and not a Satellite clone. That aside, I noticed that the car appears to be an original AC car. But for the life of me I cannot figure out what the heck is going on here with this hose routing. What is the third connection that the short bypass hose could be going to under the two hoses that appear to be routed for heat purposes (yellow arrow)? And what might be the reason for having the manual shut off valve installed inline for the heater hose (green arrow)? Any thoughts or advice would be appreciated. Thanks.