Oh wow ok thats some really good info, im gunna look into it, i didnt know about the different types i knew there was a horrible organic type thow. I was just throwing in some full strength, not half an half, and adding some water *** needed, might have been doing more harm then good, i havent got the brown sludge or rad cap foam since the second rad blew out thow

 

They are not organic coolant. But if you know your coolant has been slugged up your thermostat will prob be a bit clogged

 

All antifreeze in newer jeeps IS organic. In fact it is getting harder to find IAT(inorganic acid technology) antifreeze. OAT & HOAT is the devil if you don't maintain your coolant system. The old stuff would lose its effectiveness with age but it would not destroy your engine. Even though OAT is claimed to be "long life" I would change it every season.

 

Im definitely going to check my thermastat now might be something to do with that

 

So i have an update: i flushed my system thoroughly, i then switched over to zerex coolant which seems to be the lowest acidic level coolant out there, its roughly $18 a gallon, its seems that 50% of my problem has been fixed. Im pretty sure i have figured out the problem, the gasket between my water pump and the block it leaking, it looks wet and feels wet so it definitely is that i will be changing it when i have time next, i hope that solves the problem

 

My 01 doesn't have the 0331 head.

 

I hope your going to throw in a new water pump with the gasket.

 

I would presume in 35* weather u r using the heater which cools the coolant even more.......can't imagine the efan running in 35* ambient. How old is the water pump, fan clutch, t-stat? +/-$85 buys all 3 new.

 

Of course, no reason not to if i gatta take it off

 

T stat has been changed, but other 2 are original, clutch fan is still good i presume, it has little resistance and wont spin freely when off and cold. Whose water pump do you recommend, i went to dealer and they wanted $170 so i was like **** that i can buy 10 new water pumps before one of those, the flush really helped everything to do with cooling

 

I Don't know how bad your coolant way but sometimes you need to flush it a few times if it's really nasty

 

That is the normal operating temp of a Jeep XJ with the 4.0. It is perfectly normal for your jeep to be a little past the 210 mark. Stop worrying.

 

I got a new water pump with a lifetime warranty from oreilly's for $37.00....quadratec has an OEM for $60...just don't buy a refurbished one. it's not worth saving the $15.00

 

Don't presume a 13 year old original fan clutch is good.......fan clutch performance degrades with time/miles. The spin test is weak at best. Something ain't right if it runs hot, especially if it runs hot in cold weather. Don't guess about any component in the XJ cooling system......summer's just around the corner.

 

Yeah got that, today i did a little wheeling and it was fine for a while but then it stayed up above 210 for a while with aux fan on for about a half hour straight.... I picked up a water pump new heater core line hose that deletes the hard line and clamps all for $45 today, win! All from car quest and it was a brand new pumps, the gasket between my water pump is toast, there is a small bead of coolant that streams from the top of it every time i look, im hoping when i do the water pump its solves my issue