My truck has 192000 miles on it. It has an SCT programmer on it. 2 months ago my radiator cracked and my thermostat went out. I replaced them both and no problems until 3 weeks ago. It runs hot at the blink of an eye. It bubbles over out of the over flow tank. I pulled it apart to find the water pump was OK. I have a lot of pressure build up on my upper hose.
Can anyone assist or point me in the next or right direction. I have been given a lot of different observations . None of which have been the problem . Thanks for the help.

Carlos