Hope this helps

REMOVAL 

1. Disconnect the battery ground cable.
2. Drain the radiator.
3. Remove the instrument panel. See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair

4. Compress the holding tabs and disconnect the heater water hoses at the heater core. See: Heater Hose\Service and Repair

5. Remove the A/C plenum demister adapter.

1. Remove the screw.
2. Remove the A/C plenum demister adapter.

6. Disconnect the vacuum line.

7. Remove the heater core bracket.

1. Remove the screws.
2. Remove the bracket.

8. Remove the plenum chamber top.

1. Remove the 13 screws.
2. Remove the plenum chamber top.

9. Remove the blend door assembly from the case.

10. Remove the heater core.

INSTALLATION 

1. Follow the removal procedure in reverse order.