I just cannot figure out why i am not getting any vaccume to the heater valve, like i said, where the line that runs the heater valve comes out of is a little box underneath the glove be that that box, could it box is bad? because it has 2 lines going into it, one must be a constant because it has vacume, it just isn't getting through to the heater valve line. But I suppose that little box probably gets controlled by the main controll cluster so i guess it could be that too.... hell i dont know, all i know is it is about 400 miles to the nearest mb dealership so i need to fix it if i can, is there any way i can test this stuff with a multi-meter and a schematic? Thanks for your time