So I replaced my radiator again with the one suggested. I over heated on the way into work ect got to 250* which drug eot up to 235* needless to say I pulled over and shut her down. My lower radiator hose is cool to the touch. Hopefully someone can tell me why that is if my truck is over heating because I'm about fed up with this issue I can't seem to fix. Thanks for any help.

 

How much fluid went back in?
Did you run the truck up to temp in the driveway with cap off to see fluid flow in the degas tank?
Is the vacuum hose connected to the heater bypass valve and you ran the heater on heat until it blew hot air?

You can take the thermostat out of the system and run the truck at temp with full fluid to verify flow. The bottom hose being cold says it's not flowing thru the block.... that says pump, thermostat or air.

 

I put back in as much that came out plus what was spilt during the install. However I will try the other suggestions and report back. If my pump died randomly when I did a radiator that will sufficiently suck.

 

So the heater never got hot. Ran it up to operating temp and it never got hot. Vacuum line is on. But no flow seen in degas. Also the uper hose never got rigid like it never filled up. I guess I'll pull the thermostat first to see if that's the culprit then I guess it's the water pump though I find it so strange that it failed now.

 

Also if it is air how do I purge it?

 

Like I mentioned above. Normally if it's a small amount it will purge itself, but your having bigger issues.

The vacuum control valve needs to be open to get the air out of the heater hose and heater core. And that the hose didn't get hot, say's the valve never opened, it's controlled by vacuum.

Remove the thermostat, so it's not blocking the flow to the pump and run the truck. With it out of the equation, you should have flow almost immediately, then turn on the heater and make sure the hose gets full. Run the truck with the cap off until you see flow in the tank and keep the fluid topped off. If you never see flow, change out the pump. MAKE SURE the tank is full, if your level is to low, you'll never see it in the degas tank.

Run the truck for a bit to make sure all the air is purged. Then take the t-stat into the house with the housing, put it in a pot of water and boil it to make sure its opening fully.

 

Alright I will unfortunately I have work all week till late but I'll try and get to it as soon as I can

 

And also my level is quite low right now I lost some fluid last night due to the uper hose being lose so I'll top of off after work and retest. Thanks for all your help it'd very appreciated

 

So removed the thermostat and the heat never came. The valve is moving I can see that so it should. Then I drove it and it took a moment but it overheated well started to i drove home and parked it. Is it pretty definitively the water pump then? I opened the degas after running it and it did some wierd things like air was purging the system but still Temps weren't right. So with the thermostat removed and the problem still there you'd say pump? Again thanks for the help.

 

Oh and it blew a little black smoke if it tap the throttle which I've never noticed it do before though it could have and is probly unrelated.

 

If your not having any excess pressure in the coolant system and the lack of flow you'd have to suspect a failed water pump impeller.

 

How would I know of I'm having excess pressure. Truck isn't puking if that's the sign.

 

Also my lower hose is still considerably colder than my uper one. If it was excess pressure causing the over heat that would be just as hot yes?

 

The small hose going from the radiator to the degas bottle. Remove it from the degas and plumb in a "T" fitting with a pressure gauge. Let the truck warm up. Open cap to vent any pressure. Retighten cap and go for a ride. Watch the pressure gauge and under heavy throttle take note to the max pressure and how fast it builds pressure. If it shoots right up and starts bleeding off through the cap then I'd suspect head gaskets or cracked head.
I'm siding with an impeller slipping on the water pump shafts though. These engines potentially flow a lot of coolant.

 

Normally if you had flow. I would go after the water pump. Get one with a metal impeller. I found one reasonably priced on Amazon with a metal impeller. One day I'll order it before I'm in your boat.
Post back what you find.