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Replacing the Engine Cooling Radiator

Model: BMW Serie 3 E46 - Years 1998-2006
Part: Radiator

Remove the air filter and the intake duct protected by the cover. Remove the two side screws from the fan support, disconnect the electrical wiring connector, and using the two special wrenches, loosen the retaining nut to allow for its removal. Position a drain pan under the radiator to collect the coolant. Unscrew the hose clamps on the water inlet to the radiator and remove it. Also disconnect all return hoses. Unclip the retaining springs at the bottom of the expansion tank and remove it from its housing. Remove the pump by disconnecting the electrical wiring connector and unscrewing the two screws. Unscrew the radiator retaining screws and remove it by pulling it upward. Clean the radiator compartment of dirt. Install the new radiator, the expansion tank, the pump, and reconnect all hoses. Reassemble the fan and the air filter. Refill with the appropriate coolant. Start the engine, open the air bleed valve until coolant flows out to eliminate any air bubbles, and check for any leaks.

Updated on 2 February 2026 by ScegliAuto

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