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Engine revs up when fan is turned off. 200 1986

posted by  jrk on  Fri Oct 14 16:04 CST 2005
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last visit: Fri Jun 29 16:17 CST 2001
[RELATED]

245 w/ A/C. A/C compressor is seized. Just replaced the fan with a new IPD 5 speed.

When I turn the fan up to at least speed 2, the engine revs up about 3-400 RPM when I turn it off quickly. If I turn it off slowly, the engine does not rev up.

I assume this is a vestigial effect of the A/C control system but why does it rev up when I turn the fan off and what is the fix to make it stop?






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