On my 2000 E430 - the original fan clutch seemed to be coming on too often (I had mistakenly bent what I think is the bimetalic strip on the front/center of the OEM clutch).

I replaced the part with a brand new Meyle unit that I ordered from fast lane and now the fan clutch is engaged every time I start the car.

I assumed that the fan clutch engagement was controlled by the unit itself (i.e. there are no wires or other things attached to it).

Do I have a defective unit or have I done something wrong?

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE