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It took me a while to figure out how the vacuum motors and inlet air flaps operate in the air cleaner, since there are two inlet flaps and only one temp sensor. This isn't explained in the FSM.
When the engine is running, and the temperature is cool, the temp sensor valve is open, so vacuum is applied to both vacuum motors, which closes both flaps. Warm air is therefore pulled from the exhaust manifold "stove" into the LH air cleaner inlet.
When the engine warms up, the temp sensor closes and the LH flap opens, allowing cool air to flow into the air cleaner from the LH hood duct. Since there is still vacuum on the RH vacuum motor, the RH flap stays closed and no air flows from the RH hood duct.
When the engine vacuum drops due to acceleration or full throttle operation, the RH flap opens and cool air is drawn thru both hood ducts.
Not much at all about vacuum in it, is there. My FSM is a very early ed., even having info on carburetion, but that's another thread of know-it-alls.
Again, nice work, Roy. Those who know you appreciate your breadth and depth of knowledge.
The FSM will allow you to rebuild your car from the ground up.
