Here are the instructions for replacing the heater core. Be sure to deactivate the air bag system first. I have included the procedure for that as well.
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Thanks for asking!
Here is the only other information availabe for this.
Good luck and take care.
i need diagrams on how to replace the heater core on a 1994 firebird 3.4 liter v6
Those are the only instructions available.....you have to open the glove box all the way so it hangs down, then just remove the screws holding the core case half apart.