I need to replacement the heater core on my 2010 JKU. I tried all the quick fixes- back flush, compressed air etc. and still get almost no heat out of driver side vents. Has anyone done the replacement by cutting the dash support and the inlet and outlet on the core. I found the video on line where the two guys do it this way and it looks pretty straight forward. If it comes down to removing the entire dash I guess I will be without heat for a long time.