3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
Its probably an air lock in the system obstructing the coolant from making its way through the heater core. Put the heater setting on max, put the front of the car up, (Steep driveway or ramps) and then bleed the air out of it as per the normal process. Hopefully this will help.
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