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What it means is the 124 fans have 2 speeds , so if you had a fan on at 90C, it was a low fan and it was triggered by the a/c high pressure switch, NOT the coolant temp..you just happen to notice the low fan come on when the temp was 90C, but the 90C had nothing to do with the fan coming on...if the HIGH speed fan came on, then it would have to be triggered by the coolant temp and that would have to be 105/107C coolant temp...[ or you had a bad sw.]

So, the 2 fan speeds are different circuits , but those circuits share the same fan motor..Low fan is for a/c system and High fan is for engine temp.
It is a common misconception . The easy way to tell which fan speed is engaged is to turn the a/c off..That eliminates low fan activation on 124.

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A Dalton