Your truck is 10 years old so if it was changed 2 years ago, it already had 8 years on it and if your radiator was plugged up, so was the rest of the system. Cleaning a radiator is rarely done these days because the radiators they make now are pretty much disposable and don't clean well. You likely still had a bunch of red mud still in the system 2 years ago and that will be a problem. The chemical flushes can help but usually are not that thorough in cleaning. If you installed green coolant, you have lost all extended life properties anyway. That is a 2 year/24K coolant.
If you do attempt to flush it again, remove the T-stat first and run it for an hour or so, preferably down the highway with the chemical in it. To remove it, unhook the upper hose from the radiator side and insert a water hose into the radiator filler hole. Run the engine keeping the radiator full until all the water flows clean and then drain it, install the t-stat and refill it with coolant. I recommend staying with Dexcool.
Wednesday, September 29th, 2010 AT 7:36 AM