Drain the cooloing system. Disconnect the 2 hoses at the firewall, plug them up to avoid a spill. At the heater assembly remove all the nuts holding it to the dash, disconnect the cables from the heater unit, disconnect the plugs for the blower motor and the resistor, remove the glove box for clearance, remove the 2 bolts and nuts holding the right air duct control to the panel. remove 2 screws holding the right air duct , Now remove the heater as an assembly. once it is on the bench, remove the heater core cover and pad and slide it out, transfer pads to new core and install in case, If you had an A/C chero it would be a lot easier cause the core sits in a box under the hood, Hope this helps , good luck!