Moore4X4
NAXJA Forum User
- Location
- Shelbyville, TN 37160
Hey guys, after searching through what seems like thousands of posts and trying everything I can...I am still stumped.
Heres what is going on...
1988 XJ, newly replaced 4.0, maybe 12K miles on it at most. AW4 trans...
Never had any overheating problems before....one day it boiled over, and I concluded that the thermostat was sticking closed. Replaced it with a 160 degree stat, at the same time flushed and replaced all the coolant, and burped the system with the nose downhill method.
Went for a whole summer with very little problems, maybe getting to 200-210 at the most while wheelin at slow speeds.
Well, Trans started to get hot, so I installed a aftermarket cooler. Temperatures underhood rose, as expected, so I installed a 10 inch auxillary cooling fan, helped maintain the temp at about 200 on highway and 215 while wheelin.
While making a trash run one day, the jeeps temp rose incredibly quick, I switched on the aux fan, no help...steam began blowing out from under the hood, as the coolant boiled over out of the "turtle" as some would call it.
Temp gauge was in the red when I was finally able to get off the highway.
Sat for 45 minutes while the truck cooled....topped the water off in the reservoir, drove back to the house, had to stop 2 more times as she boiled over before I actually made it home.
All hoses had pressure on them, belt tension is good, water pump is good... pulled it out this afternoon just to be sure.
Heater core has been bypassed, no cracks in the reservoir, replaced t-stat with a factory 195...burped it every time that I have replaced coolant/water.
Tried everything that I could think of, but cannot get it to stop overheating. Its a closed loop system, but it just consists of reservoir engine block/head and radiator...no heater. No AC either, took all that out.
The only conclusion that came to mind from reading the posts is the radiator...So, took it to a local radiator shop, the tested it, said it had good flow and held pressure....doesnt mean its good right?
I am stumped...this is my daily driver, but here lately its just sitting..with a puddle of coolant under her.
After the last overheating excapade, it started sputtering real bad at idle, and blowing a hell of a lot of white smoke....
Dear god not the head gasket...
Dont even want to fool with that unless I know what might have gotten me here in the first place....
Any help would be most appreciated.
Heres what is going on...
1988 XJ, newly replaced 4.0, maybe 12K miles on it at most. AW4 trans...
Never had any overheating problems before....one day it boiled over, and I concluded that the thermostat was sticking closed. Replaced it with a 160 degree stat, at the same time flushed and replaced all the coolant, and burped the system with the nose downhill method.
Went for a whole summer with very little problems, maybe getting to 200-210 at the most while wheelin at slow speeds.
Well, Trans started to get hot, so I installed a aftermarket cooler. Temperatures underhood rose, as expected, so I installed a 10 inch auxillary cooling fan, helped maintain the temp at about 200 on highway and 215 while wheelin.
While making a trash run one day, the jeeps temp rose incredibly quick, I switched on the aux fan, no help...steam began blowing out from under the hood, as the coolant boiled over out of the "turtle" as some would call it.
Temp gauge was in the red when I was finally able to get off the highway.
Sat for 45 minutes while the truck cooled....topped the water off in the reservoir, drove back to the house, had to stop 2 more times as she boiled over before I actually made it home.
All hoses had pressure on them, belt tension is good, water pump is good... pulled it out this afternoon just to be sure.
Heater core has been bypassed, no cracks in the reservoir, replaced t-stat with a factory 195...burped it every time that I have replaced coolant/water.
Tried everything that I could think of, but cannot get it to stop overheating. Its a closed loop system, but it just consists of reservoir engine block/head and radiator...no heater. No AC either, took all that out.
The only conclusion that came to mind from reading the posts is the radiator...So, took it to a local radiator shop, the tested it, said it had good flow and held pressure....doesnt mean its good right?
I am stumped...this is my daily driver, but here lately its just sitting..with a puddle of coolant under her.
After the last overheating excapade, it started sputtering real bad at idle, and blowing a hell of a lot of white smoke....
Dear god not the head gasket...
Dont even want to fool with that unless I know what might have gotten me here in the first place....
Any help would be most appreciated.