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Once again chasing a cooling fan problem on my friend's 1992 740.
The relay that controls the radiator fan is new.
It would appear that the temperature sensor is defective. With the two wires connected to the sensor the fan runs continuously. Once one of the leads is removed from the sensor the fan stops. Bypassing the sensor and connecting the two wires the fan once again engages. So it would appear the sensor is defective as it is constantly "closed" even with cold coolant.
When he sent me a photo of the radiator showing the sensor I was puzzled as I have never seen a set up like this before. It must be an aftermarket radiator as all the ones I have dealt with had the sensor on the back side with the grommet and sensor placed in an opening in the radiator.
I hesitate to have him try to remove that large hex (plug?) for fear of it damaging the radiator shell. I don't know if the sensor will simply pull out with a little effort.
Does anyone have any experience in dealing with radiators of this type or the sensor in particular? Thanks for any help.
EDIT: Yes, we need to deal with that coolant seepage.
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Any twenty minute job is just a broken bolt away from a three day ordeal
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