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Each fan has 2 relays, for high and low speed, so there are 4 relays. All 4 are the same so you can swap them around to rule out a relay.
#1 is low and #2 is high. Book says these 2 are for fan #1, but I do not know if fan #1 is on the left or right side.
#3 is low and #4 is high, for the other fan.
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