The fan clutch on my C2 is an aftermarket Eaton replacement with an ink stamp marking of G24J3. Is this just a regular replacement unit or the heavy duty type clutch? Also, I understand you can move the coil setting from the one tab setting (say at the 12 o'clock position) to the other tab settting (6 o'clock position) to adjust when the clutch begins to engage. However, there are no markings on either tab position to advise at what temperature the unit will begin to engage. How does one tell?