It's inside the HVAC module under the cockpit, on the passenger side.
You have to completely remove the dash to get access to the heater core.
To change the heater core on a 1999 Chevy 4-wheel drive, first remove the dashboard and drain the coolant. Unbolt the core from its mounts and remove the dash panel to be able to change the heater core.
The 1999 Chevrolet Z 71 heater core can be accessed by removing the passenger side kick panel. Remove the heater core water hoses. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
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Remove the water supply hoses from your 1985 Chevy heater core. Remove the heater core retaining bolts. The heater core will come out. Reverse the process to install your new heater core.
To replace the heater core on a 1999 Chevy Prizm, first, disconnect the negative battery cable and drain the coolant from the radiator. Remove the dashboard to access the heater core, which involves taking out various components like the center console and other interior trim. Once you reach the heater core, disconnect the hoses and remove the mounting screws to take out the old core. Install the new heater core by reversing the removal steps, ensuring all connections are secure and refill the cooling system before testing.