Here is the proceedure.
REMOVAL & INSTALLATION
See Figures 1 through 5
Fig. 1: Unfasten the sound insulator retaining bolts ... Fig. 2: ... then remove the sound insulator
Fig. 3: Remove the heater core access cover
Fig. 4: Unfasten the heater core retaining bolts; most later models are secured with clamps Fig. 5: Remove the heater core from the vehicleTo install: