It is commonly suspected and misdia.
Bmw washer fluid reservoir leaking.
These cars get hot under the hood and the constant change of temperature makes all plastic components very brittle.
A used one will likely have the same issue later on down the road.
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Most of the time this happens the fluid leaks out within a few minutes.
If the tank is as old as the car then it is most likely very brittle by now and will find another way to leak.
This would be due to a crack in your windshield washer fluid reservoir on your 2011 bmw 328 xdrive.
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Remove filler hose it is not easy 4.
If you have constant low washer fluid warning regardless of fluid level it s most likely the level sensor inside the tank.
Steps to fix a bmw x3 washer fluid leak under the hood loosen the one hex screw that holds the entire basin to the frame see the first image.
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If its working properly air would be sucked in but then immediately seal itself to prevent a fluid leak in the reverse after time this valve just gets wore out and begins to fail.
You can unplug the pump unit and go to a hardware store find a small seal or gasket in the plumbing dept that fits snuggly around that end of the pump.
It is likely a very small crack if it took a whole day to leak out.
Wrap it around with piece of rubber.
Once the basin is loose pull it up carefully and tilt it backwards a bit so that the remaining washer fluid will not spill out of the hole when you remove the damaged pump see second image.
Mine cracked and fell off which allows the fluid to drain out quickly.
Remove air filter box 2.
Apply some sealant and press it in to the hole.
Remove air intake pipe 3.
I would recommend searching around for a windshield washer fluid reservoir that is brand new.
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Well the hole that fluid comes out as far as i can tell is for air to circulate into the pumping valve.
