Heater core replacement 2000 S10 4.3L. I'd like to punch the asshole at General Motors who designed this system. When Step 1 is "remove the entire dashboard" you've gone off the rails. It took me just over 4 hours to replace mine on the weekend (in my old (1992) Ford Ranger it took me about 30 minutes.) Fortunately you can find almost anything on YouTube so this video let me see what I was in for first.