Toyota 87107-04030 Unit Sub-Assy, Heater Radiator

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To remove the heater core assembly, disconnect the battery's negative cable and drain the cooling system. In the engine compartment, disconnect the heater hoses at the firewall and push the rubber seal inwards. Remove the center console, glove compartment, radio, dash bezels, and instrument panel. Also remove the heater/AC controls and ECM without disconnecting connectors. Disconnect the control cables from the heater unit. Unbolt and remove the center and lower center ducts. Loosen the screws holding the heater tubes to the housing and pull out the heater core. Installation is the reverse of removal, and refill the cooling system.