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Old 01-25-2013, 08:19 AM
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doru doru is offline
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Location: Calgary
Join Date: Sep 2007
Posts: 4,702
Mein Auto: 2003 530iA
Could be a bad auxiliary pump. Bottom left side (driver side) of the radiator.
Usually when this one goes out, there's no heat in the cabin.

To check: Open the expansion tank cap, car in "P", key in pos2, HVAC set to your normal heat comfort.
You should hear the coolant gurgling, and also see a stream of coolant (if it's topped off) coming from the upper snaked hose that sits on top of the radiator. If nothing happens, the pump is dead and needs replacing.

Good luck.
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