I used a few before (for other cars), they didn't work.

 

Holy hell. Man, forget the treatments! Just get to flushin! Also, holy hell!!!

 

Holy Hell x1000. Good luck.

 

Dam! Looks like mud LOL! Get you a gallon of aluminum brightner from a truck shop that they clean big truck aluminum with and poor a cup full in with water and start it up and let it run for 30 mins,then drain repeat till its clean

 

Did you try all of them at the same time.
I would WoW

 

Mmmmmmm cake. Lol

I'd replace everything that coolant runs through. Pump, tstat, housing, hoses, and rad (the easy stuff) and flush the rest like a stubborn turd. Repeatedly.

 

Poor ol' XJ....that's a shame.

 

Um. Forget flushing it. Replace that. And every other cooling component. Good god man. Talk about neglect. That makes me sad.

 

Yea that is also in your engine, Your freeze plugs are for sure gone and need replacing.

 

to the op

 

[QUOTE=DieselD;2071463]
I'd replace everything that coolant runs through./QUOTE]

I guess, you mean head and block?

Do you think I should replace thermostat?
Hey, guys, don't shoot, I bought it yesterday.

 

Hope someone paid u to take it. That's some serious neglect.

 

Fo real

 

Tell is more about this truck. Price?
I'd replace the entire cooling system.

 

You should just replace the entire cooling system