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I was wondering exactly how much play should be in the fan hot and cold. Which makes me wonder more if your baseline is correct.
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That is the problem. Without some sort of test appratus, and factory procedure, it's just guessing to determine what is "normal". I am not convinced that observing the fan when shutting off the engine really tells us anything. It may give some gross test of performance (freewheeling ) but whether the fan turns 1 rev or 2 revs at shutoff and being able to actually see what it is doing, and what it really means - that is the difficulty.