I am thinking of changing the switch to the lower temperature E36 one 61318361787. In city traffic my aux fan never comes on unless the AC is on, just doesn't get hot enough to trip the switch. This is good but the clutch fan runs hard all the time school bus style (in the city) and kills mileage down to 8mpg. My sons E36 doesn't even have a clutch fan and the cooler switch does it all. This switch is 80/88C vs the E34 91/99C 61311378073. Seems like a big jump but I don't see that it could cause any harm. I wont try this until I get another fan, mine sounds a bit worn and I don't trust it.
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy