The heater core is serviceable inside the vehicle. However, if the core has leaked a significant amount of coolant, the A/C housing must be removed. The housing should be disassembled and cleaned thoroughly before heater core replacement. If housing removal is necessary, refer to Heater-A/C Housing, Replacement.
Disconnect battery negative remote cable.
Remove radio/control module bezel.
Remove right instrument panel side trim. Refer to: "Instrument Panel, Gauges and Warning Indicators : Instrument Panel : Service and Repair" See: Instrument Panel, Gauges and Warning Indicators Instrument Cluster / Carrier Service and Repair
Remove two screws at lower right side support beam.
Remove bolt for instrument panel support at A-pillar.
Remove left instrument panel side trim.
Remove upper instrument panel bezel.
Remove lower knee bolster.
Remove console screws at instrument panel.
Remove gearshift knob.
Remove shifter bezel.
Remove console screws at rear. Remove rear half of console.
Remove front console screws. Remove front half of console.
Remove right side instrument panel support strut.
Drain coolant. Refer to: "Engine, Cooling and Exhaust : Service and Repair" See: Engine, Cooling and Exhaust Cooling System Service and Repair
Remove heater hoses at cowl.
Remove heater core cover screws and cover.
Remove heater core.
Carefully install new heater core into the heater housing.
Fasten heater core cover to housing with screws provided.
Reinstall all necessary trim.
Fill coolant to level.