The Heater Core Replacement Step :
1. Disconnect battery ground cable, then drain cooling system.
2. Disconnect hoses from heater core.
3. If equipped with A/C, remove evaporator/blower housing as follows:
a. Discharge A/C system, then disconnect hoses from expansion valve.
b. Disconnect electrical connector and vent tube from blower motor.
c. Remove console, if equipped.
d. Remove lower instrument panel attaching screws, then the lower panel.
e. Disconnect electrical connections from A/C relay, blower motor resistors and A/C thermostat.
f. Disconnect vacuum hose from vacuum motor.
g. Cut evaporator/blower housing to heater core housing retaining strap, then disconnect heater control cable.
h. Pry retaining clip from rear of blower housing flange, then remove the three retaining screws.
i. Working from engine compartment, remove evaporator/blower housing attaching nuts, then the evaporator drain tube…..

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