I did a heater core once. Just once.... 87 Z28. NEVER AGAIN! lol Call a pro. It is not a difficult job, but if you even get access to the core without removing the dash, it is super hard tight under there. I would however poke around and see where it is.
The heater core was leaking under the dashboard. I had a 1995 Chevy S10 and the heater core was leaking. I bipassed it for awhile but it sucked driving in cold winter weather and the defroster couldn't work without it and felt like I was in a freezer driving to work. Chevrolet dealer wanted $1,000 to replace it. I ended up doing it myself and it was a son of a bitch. I remember the hardest part was getting the speedo cable detached doing it blind. I also had to drop the steering column to get the dashboard out. The brackets under the dashboard was razor sharp, I got cut several times. When all was said and done I think I had 3 screws left over ,but everything worked . It took me around 6 hours to do it.
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