Heating system components
Remove the heater housing cover from the housing-1992 Wrangler shown
Remove the heater core retaining screws
After removing the retaining screws the heater core can be separated from the heater housing
The heater housing assembly must be removed in order to access the heater core.
Drain about two quarts of coolant.
When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.
Remove the heater housing assembly as outlined earlier in this section.
Remove the heater core from the housing.
Install the heater core to the housing.
Install the heater assembly to the vehicle.
Properly refill and bleed the cooling system.