GM 22737140 Core,Heater

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Heater core removal on these models is quite involved and requires the removal of the entire dash (instrument panel) and the evaporator/heater core housing. First, have the air conditioning system discharged by a dealer service department or an automotive air conditioning shop before proceeding. Then, disconnect the cable from the negative battery terminal. Drain the cooling system. If the coolant is relatively new and still in good condition, it can be saved and reused. On four-cylinder engine models, there is an additional drain plug on the bottom of the water pump. Be careful to clean up any spilled coolant. Disconnect the heater hoses from the heater core fittings at the firewall. Disconnect the refrigerant lines to the evaporator core at the firewall. Plug all open lines and fittings to prevent contamination of the air conditioning system. Remove the instrument panel. Set the panel upside-down on a protective surface. Remove all of the harness electrical connectors to the evaporator/heater core housing. Remove the plastic air ducts that are in front of the housing that lead to the floor. They are held on by two screws at the top and a small push-type fastener at the bottom. Remove the mounting bolts that hold the evaporator/heater core housing to the instrument panel. Make sure that nothing else is attached to the housing, then separate it from the panel by pulling it straight up. Keep the housing upside down to get to the heater core cover. The heater core cover on the evaporator/heater core housing is the section of plastic that is closest to the heater core pipes. On most models, you can remove the cover screws to remove it. On some models, however, there are heat-staked (plastic) spots that must be drilled out. The cover is designed for mounting screws to be used when the cover is placed back onto the housing. You will need to get these screws from an authorized dealership parts department. With the cover removed, pull the heater core out of the housing. Place rags under the heater core pipes to catch any excess coolant that may spill. Installation is the reverse of removal. Don't forget to reconnect the heater hoses and refrigerant lines at the firewall using new sealing washers for the refrigerant line fittings. Refill the cooling system when you're done. Reconnect the battery. Have the air conditioning system evacuated, recharged, and leak-tested by the shop that discharged it.