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How to Replace the Cabin Heater Radiator in a BMW 3 Series

Model: BMW Serie 3 E36 - Years 1990-2001
Part: Heater core

Below are the instructions to remove and replace the cabin heater radiator in a BMW 3 Series. First, open the hood of your car and start disconnecting the heater radiator hoses by pressing on the metal clamps. Next, remove the screws securing the heater matrix box by unscrewing the bracket screws to take it off, as shown in the video. At this point, install the new cabin heater radiator, pouring in the radiator fluid and reassembling all components!

Updated on 7 June 2026 by ScegliAuto

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