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I haven't looked inside the engine compartment in a few weeks, but based on that drawing in the TM and the pictures I have handy of my truck's engine compartment, I think that valve isn't easily visible from the ground. I think you'll need to climb up into the passenger side of the engine...

That would be the "personnel heater vent valve", not "personal heater vent valve". It's just a little drain valve, like a radiator drain valve or the air tank drain valves. It's located on the heater box inside the engine compartment. It's at a high point in the heater core, and lets you bleed...