If the coolant sensor is working and the tank is full of water, the sensor simply lets the 12 volts pass through from theīrown/red wire and back out the brown wire where it travels on to earth. The brown/red comes from the overhead check control panel and travels down to the coolant sensor carrying 12 volts. You have 2 wires present at the coolant tank sensor, a brown and a brown/red. Pic is below, i pulled back the rubber cable/connector cover for clarity.ġ) How do I replace the connector? (i.e., looked for a long time here and on Realoem, cannot locate a part number for the connector).Ģ) How do I troubleshoot the issue? It might have something to do with the small piece of cable I found separating from the connector (again, circled above in orange)? Can I use a voltmeter to check for continuity? If so, how?Ĭompared to some of the other circuits on the e30 chassis the coolant level check circuit is relatively straight forward. I tried re-installing the old coolant level sensor, and I still get the error light. Ever since I replaced the sensor, I've been getting an error light on my check panel. Also, there was a small piece of cable that came loose when I removed the cable/connector from the sensor (circled in orange below). When I removed the cable/connector, I noticed that the connector was cracked. ![]() I removed the cable/connector and installed the new sensor in the tank. ![]() When I replaced a coolant hose off my expansion tank, I also replaced my coolant level sensor.
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