Any thoughts on a simple cable actuated valve( 5/8" ) for the inbound hose to a heater core?  I have thought about not routing air through the heater core when I don't want heat, then have the flapper route the air through it when I do want heat.  But, with the temps hitting 90F+ in N. Carolina I am reminded that it might be best to not have any extra heat in the cabin in the summer...

Thx...
-Scott