How do you remove heater core housing from firewall on 1996 gmc jimmy?

Cut top of black plastic cover where its marked . Left side of firewall. Rip off cover .

Now cut the next layer of plastic cover to see the fan . Unscrew the 4 screws and remove complete fan assembly. Took me aprox 2 hours.

Replace plastic covers and silicone in place or just ducktape like I did . Good luck!

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