Sounds liek a job you may need some real help on so...I
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The AC power relay is located behind the right side of the dash on a 1991 Chevy Corvette. It is on top of the plenum.
You do not need to completely remove the dashboard in order to change the heater core. Remove the water hoses from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
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replace heater core in a 1991 Chevy work truck 1500
you may have to remove the intake from the block and then use an extractor tool to remove the rest. then replace the connector.
diagram for a 92 Chevy van g20 Heater core
Open both front doors and remove everything from the firewall to the front seat. No joke.
I recently installed a new heater core in a 1991 G10 van. I removed the heater fan housing, the heater core hoses, then the compartment came out. After removing the campartment has to be taken apart to replace the core. Alot of work but not all that hard.