Sadly my Xj was towed home tonight. It would heat to the line right abouve 260 then go back to the line after the 210 then back like 5-10 min later. Then notice mud looking stuff in rad and the oil looks fine. T-stat??????? help sry its late and i had no clue what to search for. Plus i need it back thanks in advance.

 

"mud looking stuff in rad" ouch! that sounds like oil in your coolant. Could be cracked head or flailed head gasket. A compression and leak down test may confirm what happened.

 

yup. thats not mud in yer radiatur. that would be olier. i would do a teardown of your head and you will either find one of two things. a cracked head, or bad gasket. check the cap for your oil fill. is there a white foam on it. if there is then you have coolant in your oil. teardown commense

 

Looks really rusty and like it was sludge built up in the rad. The i dont loose any antifreeze that i know of. I think i will go get a prerssure tester. My oil pressure is normal and my oil looks normal. What is the leak down test?????? It is a 99 cherokee 4.0 I6.

 

I was in the process of typing and taken pics and uploading before i seen ur post sry. FIgure pics would help. I bought it bout a month ago.for 500 bucks.

 

Heres a pic of the cap. Could it be possible that it had one and the never clean out rad. and the t-stat finally got clugged i know the had in shop then went ahead and bought a new one and fix and sold this one.

 

That sludge will cause the symptoms you are describing, a Serious rad flush is in order, mabye replace it. You can drain the radiator and run CLR through it, several times, I would replace water pump, thermostat, and hoses.

 

Does seem like it would be from crack head or gasket tho since i not loosing any fluids.

 

That's some nasty stuff. Drain your oil and while it drains put some in a glass jar as it comes out. You can let it sit for a hour or so and see if it seperates the water an oil. If it does....get it fixed asap. If it just has stopleak in the radiator, find the prior leak...fix it...n flush it a few times. 500 bucks you got a deal even if the engine needed replacing. You will never get rid of your jeep....too much fun!!!

 

Well took spark plugs out everthing loojed good replace rad/tstat and water pump for 133 bucks puttin back together now. Going to flush the motor really good. How do i flush leave vottom hose unhook and start motor and run water through rad???????

 

flush the radiator by putting you a/c on HEAT. to open up the heater core. open your radiator valve and put a cold water hose in the radiator through the fill zone. turn your jeep on and let it clean it out. run it clear as many times as you can. then run coolant in untill it runs that color.

 

Thanks man

 

yupp

 

I dont know how she even move coolant.

 

what?