Chevrolet 52469251 Core,Heater

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To remove and install the heater core in Cadillac DeVille and Fleetwood models, start by disconnecting the negative battery cable and draining and recycling the engine coolant. Then, use tool J-37097 or an equivalent tool to disconnect the heater core hoses. Remove the right side sound insulator and the glove box module, along with the programmer shield if it's equipped, and disconnect the air mix valve link. Detach the programmer vacuum and electrical connectors. Afterward, remove the heater core cover, leaving the programmer attached. Proceed to remove the heater core retaining screws and the heater core itself. To install, position the new heater core and secure it with the retaining screws, then attach the heater core cover. Reconnect the programmer vacuum and electrical connectors, and connect the air mix valve link. If there's a programmer shield, install it as well. Finally, connect the heater core hoses, the negative battery cable, and fill the cooling system. Adjust the air mix valve as specified, reinstall the right side sound insulator and the glove box module, and you're done. For Eldorado and Seville models, follow a similar process. Disconnect the negative battery cable and drain and recycle the engine coolant. Remove the glove box unit and right side lower sound insulator. Take out the programmer, detach the threaded rod from it, remove the vacuum connector retaining nut, and disconnect the vacuum and wiring connectors. Remove the programmer, and for early model vehicles, disconnect the wiring connectors from the BCM and PCM, remove the mounting brackets, and proceed with the heater core removal. Remove the heater core cover, disconnect the heater hoses, and remove the heater core retaining screws. Install the new heater core, heater core cover, and programmer (if applicable), making sure to reconnect all necessary components and fill the cooling system. Finally, adjust the air mix valve as instructed, and reinstall the right side lower sound insulator and the glove box unit to complete the installation.