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On the 2.0L EGT, the engine should speed up a couple of hundred RPM when raising the fan speed from "2" to "3" or above. It is as SBR11 states above, the higher fan speed requires more current. At the lower engine rpm the additional current draw without speeding up the engine will cause a voltage drop from the alternator.

This was discussed about 18 months ago on one of the forums. You should see the tach jump ~200 to 250 rpm when switching between 2 and 3. Actually, pretty smart design. Gains maybe .002 MPG in fuel economy. :)
 
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