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2000 E46 330ci - Intermittent low coolant level fault

5K views 1 reply 2 participants last post by  dailydoggy 
#1 ·
Shortly after we got our 330ci I replaced all of the coolant system bar the hoses.

Since then we have had an intermittent coolant level sensor fault.

I'm pretty sure it is the coolant level switch, as I can remember dropping it, and I have since checked the level, bled, etc many times and it still does it.

Level light comes on shortly after startup and then will go out a few minutes later, generally as the temp gauge has hit mid way.

As they are cheap I plan to try a new level switch, worst case I guess it could be a dodgy expansion tank as I gather the level switch is just a reed switch detecting the magnetic float in the bottle?

Anyway, what is the best way to partially drain the coolant to replace the switch? I was considering just removing, getting wet and re-fitting new one, then re-bleed/top up, but I'm guessing there might be a better way!
 
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