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Old 06-22-2004, 10:57 PM
OKC190 OKC190 is offline
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Join Date: May 1999
Location: Oklahoma City, OK, USA
Posts: 28
A little more information on the aux fan cycling. I pulled the connector on the coolant sensor, and to my surprise, the fan continued cycling on and off. I'm sure I have the right 4-pin, but without being connected, I would have expected to have the fan not run at all, or to run all the time. I'm pretty confident that the sensor is fine. It has all the correct resistance values over a range of temperatures. I don't understand where the ecu is getting the signal to turn the fan on and off. I can hear the relay pulling in and out. Any other ideas?
Ted Beer
'91 190E 2.3
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