1. Drain cooling system.
2. Disconnect hoses from heater core. Plug hoses and core openings to prevent leakage of residual coolant.
3. Remove heater core access cover attaching screws and the cover, Fig. 12.
4. Pull heater core rearward and down, removing it from plenum assembly.
5. Reverse procedure to install. Do not over tighten hose clamps.