I replaced my thermostat and Expansion Tank on my
2004 330XI. There are no leaks and the coolant is full.
When I start her up the low coolant light just comes on and
stays on. I have read online that this could be a bad
Low Coolant Sensor. But I did replace that when I
replaced the Tank. It was not a BMW brand.
Someone also suggested I plug the old sensor into
the lead and turn it upside down. Light still on.
I have drained the system 4 times through all
this. If the new sensor is not working I guess the only
way to know for sure is to once again drain the
system and try a better sensor? Or am I missing
something? Help!
This sensor is a very simple device. It’s basically 2 thin pieces of metal that are just barely separated. The red tank level bar has a magnet in its base. When the level is low the magnet surrounds the 2 thin pieces of metal, and the magnetic field forces them together. That lights the warning light in the dash.
One of the “rules” that I follow is to never install an aftermarket sensor of any kind in my bimmwe. This is no exception. I’d reinstall the old sensor and see what happens. Now, if the light still comes on then there’s a wiring short somewhere.
The problem might be in the wiring or the plug connection. Check those too.
We had issues with e36 after market sensors the pin size was wrong so it wasn't making a good connection
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