I have a vintage air setup in my truck along with my LS swap. The vintage air kit has a 'coolant shut off valve' which appears to be totally useless most of the time. It's electric and when the truck isn't running the valve opens when the ignition is off and is potentially allowing coolant to still flow through which is affecting the performance of the AC. I was considering adding a manual ball valve into the the return line to prevent any flow that may get past the vintage air valve. I also considered a "bypass" type valve like those that came on earlier escalades and tahoes
http://www.rockauto.com/en/moreinfo....nid=394&jpid=1. My thought would be to remove or disable the vacuum pot and manually move the arm into the desired position. This would allow coolant to still flow as if the heater core were in the loop. Any thoughts or advantages to one system over the other?