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If you look in the box with the printed circuit diagram on it (it looks like a control box in your pictures...) the fan and high limit should reside in the box on your furnace. More than likely it is a combination limit. One side does turns the fan on and off. It is normally open at room temperature. The other side is the high limit. It provides overheat protection and cuts off power to the burner if it gets too hot. This switch is normally closed at room temperature.
So, if you have the power off to the furnace, a ohm meter reading across the fan limit will show open or infinite ohm value indicating the switch is open. The high limit will show 0 ohms indicating that the switch is closed.
Now, power down the furnace and remove the cover with the diagram on it and have a look inside... Take another picture if you can on the guts inside the box.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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