i havea 2005 with the 5.7 i recently had a small coolant leak so i figured i would put some stop leak in it. it stop leaking ut now over heats!! i replaced the thrmostat and nothing changed i also drained all the **** out and refilled with antifreez and it still over heats. its not under warranty so wtf do i do??? any thing would help

 

the stopleak probably plugged the radiator... stopleak is a good quick fix, but not good for the long run. i have a used radiator off my 03 that has 25k mi on it if you're interested. I replaced mine thinking that was the problem. turns out it wasnt, and the radiator is perfect.

 

I did exactly the same thing with my 03.
I had the common and infamous split plastic header tanks, on the sides of the rad.
It was weeping ever so slightly and was using about 2 pts of coolant, over two weeks.
It took ages to isolate where the leak was. A total pig!
Anyhow, I put the "stop leak" in and then the thing would cycle, from normal temp to 3/4then back to normal, over a 3-5 min period.
Anyway, I replaced the stock thermostat and replaced the rad which was now plugged with all that stop leak gunk and flushed the cooling system.
Problem solved for me.
I'll never use that stop leak crap again.
As someone said to me at the time, "fix it once and fix it right first time".
Al.

 

My vote is radiator also. Especially if the coolant have never been changed.

 

+2 on that sir!

 

Sounds like your radiator

 

do you think if i take it to like jiffy lube and get it flushed mabey that will fix it.

 

Why don't you do the flush yourself it's not that hard and that way you can save some money for yourself just in case you have to get another radiator.

 

The only thing Jiffy Lube will do is finish ruining your truck.

 

+1!! Any autoparts store has an easy flush kit made by prestone i beleive. its really the only correct way to do it. again, if that fails and you need a new radiator, let me know. i've got one i need to get rid of i'll sell ya. PM me