GM 22784517 Core Assembly, Heater

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To remove the heater core in a 1999 Deville, start by disconnecting the cable from the negative terminal of the battery and draining the cooling system. The heater core is located in the passenger compartment, under the instrument panel. Disconnect the heater hoses at the firewall and remove the instrument panel to access the heater core cover. Disconnect the rod from the programmer to the blend-air door and disconnect the vacuum and electrical connectors from the programmer. Remove the heater core cover mounting screws and pull the cover away from the heater housing. Remove the two core mounting screws and carefully lower the heater/air conditioning assembly from under the dash. Installation is the reverse of removal. For a 1999 Seville or 2000-2005 model, the heater core is also located in the passenger compartment, behind the instrument panel. Disconnect the heater hoses at the firewall and remove the instrument panel. Remove the heater core cover mounting screws and pull the cover away from the HVAC assembly. Remove the heater core retaining straps and mounting screws, then remove the heater core from the HVAC assembly. Installation is the reverse of removal. For 2006 and later models, the heater core is contained in the HVAC assembly, which includes the heater core, evaporator core, and various mode doors and actuators. Have the air conditioning discharged by a qualified technician. Remove the right engine mount strut, windshield washer fluid heater, engine trim cover, and upper tie bar in the engine compartment. Disconnect the evaporator hose and heater hoses from the core. Remove the brake pedal assembly and reposition the carpet to allow room to move the HVAC assembly. Remove the instrument panel center support bracket and reposition the auxiliary air duct. Remove the instrument panel carrier and disconnect the HVAC assembly electrical connectors. Remove the heater core-to-NC pipe cover screws and remove the heater core. Installation is the reverse of removal.

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.

The right side sound insulator, glove box module, and programmer shield (if equipped) need to be removed. The air mix valve link, programmer vacuum and electrical connectors also need to be detached.