Help! 84 K10 heat selector vacuum source question

[Lmbull]

I just picked a '84 K10 short bed that's needs some TLC.  I have heat through the vents on the front of the dash whether the selector is set to "off" or another setting. I'd swear I read somewhere that the vacuum source for the heat selector came from somewhere on the AC. The truck had AC but it was removed. I would very much appreciate any help that could be provided. I live in Ohio so defrost is an absolute must.

[bake74]

     Did you check to make sure the selector switch is actually moving the flap between forward and defrost ?

[Lmbull]

The problem was a cracked hard plastic vacuum line that connected to a T from the reservoir.

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[bake74]

     Cool, at least you now got it fixed or shortly will.