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The fan is set to auto.

Use the pen tool to trace the road (make sure you are clicking in the center of the road).
When you are finished, change the thickness (stroke) of the line using the Stroke pallet.
Then you can...

The fan on my Carrier runs non-stop. The burner kicks on from time-to-time, but the fan is a constant. It never did this until a few weeks ago (settings didn't change). I put new batteries in the...