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Originally Posted by vwbuge
When I flushed it didn't look bad at all. BUT the water just smelled really, really stagnant. I will give it more time and see what happens. That is what I don't understand, I seem to have tested just about everything and my heat is still weak. I just ordered a new thermostat to be on the safe side. I will see what happens when I install that. If there is any breakthrough I will post back here.
Thanks everyone.
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Stagnant water could be telling you that the internal surfaces of the fins are rusted. If so, they won't transfer heat from the coolant. I had this occur with my tankless coil on the house furnace. After 20 years, the rust buildup on the copper fins prevents heat transfer. Finally had to replace the coil. Problem solved.
In your case, you've ruled out everything else. It's time for a good citric acid treatment. I'd leave it in there for at least 100 miles and drive the hell out of it, in an attempt to clear out the rust.