BMW 730d Heater Matrix Leak — Steam From Vents
The heater matrix on E65/E66 is located deep in the dashboard behind the centre console. When it fails, coolant leaks into the cabin causing sweet-smelling steam from the vents, fogging windscreen and wet carpets. This is a significant job requiring partial dashboard removal. Repair cost is £600-1,500 at a specialist.
Repair / Solution
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No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this BMW 7 Series 2002 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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