Fuse is good, when disconnecting coolant sensor they won’t come on. What’s the next thing to check? Relay? Module?

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

I think it's supposed to come on when the overheating sensor makes connection with the block not the other way round


Also there is a pressure switch on the a/c receiver/drier that when it shorts the fans come on at low speed

EDIT: Because your car has a 93 M104 (HFM) then it may not have an overheating sensor it may just have 2 sensors (ecu and gauge) but i'm not sure

I thought they were soppose to default to full speed when the coolant wire is off. Either way the ac on or high temp they don’t come on at all. Has 3 sensors. 1 2 and the 3 pin. I have zero power going to the fans at all

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

wiring diagrams with fans (I hate 93 and newer diagrams):


https://www.startekinfo.com/StarTek/outside/12264/Program/ETM/24832001.pdf


https://www.startekinfo.com/StarTek/outside/12264/Program/ETM/24072001.pdf