Try the repair tips on the Autozone web site.
How do you remove the heater core on a 1997 Toyata Corolla?
You will need to remove the anti-freeze from your 1997 Chevrolet Venture cooling system. Remove the water lines from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
Drain the water from your 1997 Chevrolet Lumina cooling system. Remove the water supply lines to your heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
Begin by training the water from your 1997 Pontiac Bonneville cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
To remove the heater core from a 1997 Cadillac Seville, start by disconnecting the negative battery cable. Then, drain the engine coolant and remove the dashboard and center console to access the heater core. Disconnect the heater core hoses from the engine compartment, and unbolt the heater core from its housing. Finally, carefully remove the heater core from the vehicle, taking care not to damage any surrounding components.
remove the entire dash
To change the heater core in a 1997 Oldsmobile LSS, start by disconnecting the battery and draining the coolant from the radiator. Remove the dashboard and any components obstructing access to the heater core. Disconnect the heater core hoses from the engine compartment, then unbolt and remove the heater core from the housing. Install the new heater core by reversing the steps, ensuring all connections are secure and refill the cooling system with the appropriate coolant.
you might be able to just go through the back of the glovebox to get to the heater core
it should be below the radio in the heater box . must remove entire dash
How do i change the heater core on a 1997 ford e150
get a chilton guide book
Drain the radiator. Remove the heater hoses from the fittings at the firewall under the hood. Loosen the dash, and pull it out enough to reach under to the heater core. unbolt the core, remove, then replace. Reverse the procedures to finish the installation.