Cabin & comfort
Cabin heater heat exchanger
Transfers coolant heat into cabin air on equipped systems.
Inside the HVAC housing behind the dashboard.
Air passes over coolant-heated fins while blend controls determine cabin temperature.
A small indoor radiator.
Poor heat, misting or coolant odor can involve flow, controls or leakage.
Filters use the service schedule. Motors, controls, seals and trim are inspected for condition and operation.
A filter or switch service differs from dashboard removal or a complete seat mechanism; access can be the main expense.
Electric BMWs may use different cabin-heating equipment, so a combustion-car heater layout is not universal.
BMW cabins as equipped; controls and comfort hardware vary substantially by generation.
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