Disconnect the negative battery cable.
Drain the radiator.
Disconnect the heater hoses. Plug the core inlet and outlet.
Remove the nuts from the air distributor duct studs on the firewall.
On 1970-77 Camaros: remove the glove box and radio, then the defroster duct-to-distributor duct screw.
Pull the defroster duct out of the way, then pull the distributor duct from the firewall mounting. Remove the resistor wires. Lay the duct on the floor.
Remove the core assembly from the distributor duct.
Reverse the procedure to install. Use new sealer on the duct flange, if necessary Fig. 1: Schematic of the airflow through a typical Camaro heating system
Fig. 2: The heater blower motor mounts to the left-hand side of the firewall in the engine compartment