Heater Core Replacement Instructions For 1983 Chevrolet Camaro -

Step 1.) Take EVERY usless f-ing stupid thing apart interior wise
Step 2.) Replace heater core
Step 3.) Put EVERY uesless f-ing stupid thing back together interior wise
Step 4.) Find out that you have a few extra screws and bolts
Step 5.) Drink a few tasty beers and forget about it

You can now enjoy your working heat, leak free! And hope those extra nonsense parts weren't anything too important ^.^