Quote Originally Posted by Jmuirhead9 View Post
UPDATE:

Got my hands on a combustion leak tester kit...which showed no results of fluid changing color. It even had enough pressure to blow through the tester I did not have to use the hand pump or vaccum line. I tried it out of my exhaust pipe to be sure, and it turned yellow instantly.

So if this means that I have no issues with head/gasket leaking compression, what else would be forcing coolant to bubble out?
Feeling good if this means that it's only something to do with the cooling system and not engine.

Thanks again
So after going through the hole thread and taking this information as gold. I'm guessing there is a hot spot on the head or block. Now way back when you first started this was the water black and nasty?
Also. it could be a water pump and radiator problem. If it's not getting enough flow through the radiator it will allow water to boil on the rear cylinders. I have seen engines that shed a lot of rust and it collects around the rear cylinder causing a low flow. When driving these things will pump 30 gallons a minute. Water is flying through an engine. A train will pump 500 GPM. So have the radiator rodded out and swap out the pump while your doing it.
Also how hot is the heater? stick a thermometer down there and see how hot it is. If you can test it on the water lines them self. One of them point and shoot temp tools are great for finding hot spots.
Keep us up to date.