I just replaced my heater core with the help of Battchief's instructions. I had priced the job out and it came in around $1500. My son (21y/o) and I completed it with only a few glitches that were our fault. We didnt prop the hood securely and a big gust of wind knocked it over ripping the wires from a few lights. I had cummins radiator build us a new one and putting it back together was a snap. This was on a 2000 Winnebago Journey. If you have the replacement core in hand this is definitely a 1 day job. Thanks again.