What you have too do is heat the truck up and as the truck is warm take the small hose off the head and take the cap off the water bottle on the side wram engine!!! not hott!!! let the water and antifreeze come out of the small hole it needs too be bleed from the replace hose back and it should be fine warm moter not hott!!
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If the t/stat fails in the closed position an overheat will result. I have had a brand new one fail a week after I put it it. Rare but does happen. Have you checked the rad hose, is it warm, hot, or cold during the overheat condition? Is the coolant actually flowing through the system? When its cold (after sitting overnight) remove the rad cap, look at the fluid level...normal? If so start the car and let it run with the cap off..feel the rad hose soon as it starts to get hot look in the rad (be careful if your system has a vapor lock it may spit the air out, best to have a face shield on just in case!)..is the coolant flowing? It should start flowing at some point. If not the t/stat is stuck closed or the water pump is broken/seized.
It is more than likely your water pump. Can you run it in park with the radiator cap off. The cap on the radiator not the overflow tank. When the temp opens the thermostat you should see flow if the pump is good no flow it is probably bad. If you don't see flow check the upper hose for temp and the lower hose. If the upper line is barely warm and the lower hose is significantly hotter, it is either water pump or thermostat, but since you replaced the thermostat I would be back to water pump. BTW you should use either a contact thermometer or an infrared to check hoses, although it was done by hand in the old days.
Have you tested the thermostat yet? Are you "sure" it's working?
That engine is NOT known for having water pump impellers going bad at all. I would believe a bad t-stat before a bad water pump. In my enperience if it's now flowing water, start there.
If you can, take the t-stat out and put it in a pot of boiling water on the stove. Use a meat thermoneter, or even a cany thermometer and check the water temp. the T-stat should open up on it's own, even without water flow between 195 and 210 degrees. If it isn't, there's your problem. Start there, ESPECIALY if you "just put in a new T-stat." I've had FOUR bad t-stats brand new out of the box from 3 different suppliers in 15 days at my shop. I'm testing them before installing them now.
Your problem sound like i need more information like dose the water blow out of the headder tank when it gets very hot very quick,,how much water will it loose in 3 minutes running,, can you see a white colour smoke out of the exhaust when going,, what colour is your oil in the engine when you dip it,,when you removed thermostat did it make any differance to getting hot (time wise)
I must know the answers to all questions
Let me know ASAP Ron
Take out the thermostat and run it like this for while. If the motor still over heats: Look over by the battery, do you see where those two hoses from the radiator and the water manifold are going into the firewall? Take the hose going to the manifold from the firewall off of the connection at the firewall and connect it directly to the water pump. I think the manifold hose is the one on the right just make sure it's not the one coming from the water pump. You'll have to remove the hose coming to the fire wall from the water pump where it is connected at the pump but, that's OK for now just tie/tape it to something out of the way. Now then, your water pump will be sending water directly to the water manifold without any obstruction. When you run the motor for a little while and find that it stays super cool, I then suggest (if you want any heated air this winter) that you have the heater core (there behind the firewall where the two hoses were going) flushed clean or replaced and hooked back up. Once water can flow freely through the system your thermostat can probably be reinstalled w/ out overheating the motor.
I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.