BMW E28 heater core leak and replacement
E28 heater core leaks into the footwell and the heat is weak – what is going on?
The core can leak coolant into the duct in the driver's footwell. A clogged core also weakens the heating: the E28 has no filter before the core, so sand and leaves get into it. Cleaning can improve airflow, but a leaking core has to be replaced.
Can I reach the E28 heater core without removing the dashboard?
Usually not. The core does not come out without removing the dashboard or taking the whole heater out of the car. Dashboard removal starts with the front seats and the centre console, after which the control panel, the instrument cluster and the A-pillar trims are removed.
What should I note when removing the dashboard in the E28?
The dashboard is held by two bolts at each end and one screw under the instrument cluster, and it rests on the steering column with a plastic bracket. It is best to detach the control cables from the control lever rather than from the housing, which makes reassembly easier.