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      12-24-2012, 06:32 AM   #4
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Drives: E90
Join Date: May 2012
Location: MARLAND

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The pump is very quiet when it is working. The only way to check if is working is to open the reservoir cap, look inside when the pump is in venting mode and see if you see the coolant circulating. Also, when the pump is working it should slighly pressurize the system, so you could try to feel pressure by putting the palm of you hand over the openining.

If you find the pump is working, then you will need to re-vent the system with the cap closed and vent screw closed.
Efthreeoh is offline   United_States
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