Well, half of the thread is about a misunderstanding of cap descriptions. I never said I was running a "pressure cap" on my car, but a "sealed" cap, (like part #21 in the diagram) so my car is set up and running properly if I'm not mistaken (pressure cap on main tank, sealed cap on expansion tank).
We've agreed that putting another "pressure cap" on the expansion tank is not the way to go.
I went back and read somewhere the OP took his car to a shop and they suspected a sensor, and he's closely watching the car now, as well as watching the fans.
That's where things stand I believe.
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