GM 22728343 Core Asm,Heater

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To remove the heater core, start by disconnecting the cable from the negative battery terminal. Then, drain the cooling system and disconnect the outlet heater hose at the thermostat housing or the heater core pump, depending on the engine type. Make sure to drain any excess coolant from the heater core into an approved container. Next, disconnect the heater hoses from the heater housing inlet and outlet pipes at the firewall. Inside the passenger compartment, remove the right console extension. After that, remove the heater pipe clamps from the couplers at the heater core and remove the pipes, placing rags underneath to catch any spilled coolant. Finally, remove the heater core retaining strap mounting screw and pull the heater core out of the housing. To install the new heater core, simply reverse the removal steps, making sure to reconnect the heater core inlet and outlet hoses at the firewall. Don't forget to refill the cooling system and reconnect the battery.