Had a quick question on 3 pole coolant temp sensor located near the top radiator hose. I power washed the engine and looks like some water got on this sensor, every time I start the car even from cold the aux fan kicks in.
I unplug the sensor the fan goes off.
Question is that my sensor has a RED top and the only ones I see for sale have a blue or green top. Do these units superceed the red top sensor? What are the differences between them?
1987 300D

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1987 300D
2005 E320 CDI