So tonight I finished up flushing my heater core with CLR. Let me tell you, my heat is sooooo damn hot now that it will cook you out of the Jeep
I followed this picture to get the coolant flow. I used the INLET as OUTLET, then I used the OUTLET as the INLET and back flushed the system using CLR. I first got all the coolant out using an air compressor and about 125 psi, after I purged all the coolant out, I then proceeded to fill the heater core going through the outlet with CLR. I poured all the CLR in till it came out the inlet side. I let the CLR sit for 1 hr.
After the 1 hr elapsed, I purged the CLR out till all I got was air, them proceeded to fille the heater core with water and purge with air, I did that about 5 times. It was taking to long so I decided to get the water hose and purge out the heater core till the water ran clear, then again I purged it air till no more water came out.
Then I re-attached everything and proceeded to fill up the coolant lik you normally would do.
I noticed after shutting the Jeep off that I had air bubbles coming through the overflow tank which made me beleive that I had not got all of the air out of the system even parking on a little angle. So by this time it was cold out and I said forget it. I drove back home bc I was doing the work at mt g/f's dads house. So when I got home, I checked the level in the over flow tank and it was pretty dry. So I opend the radaitor cap back up, opened the overflow tank back up and I poured more coolant into the over flow tank to the FILL mark and proceeded to fill my radiator back up. The radiator burped a couple time and I added coolant as necessary. So I'm pretty sure I got the majority of the air out. I will drive it the next couple of days and check the overflow tank and radiator
I used this youtube and this process couldn't have been any easeier!