'99 XJ Overheats in uphill/snowy conditions
#16
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Could be as old as the jeep itself. I actually just purchased one that should be here Thursday. Got that and a thermostat. What do you guys think about CSF rads? This site and others seem to like them.
#19
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Year: 2001 / 1999
Model: Cherokee (XJ)
Engine: Fire breathing 4 point Oh!!!
Are your fan shrouds in place? Post afew pictures of the engine bay, from different angles. Let us take a look.
#20
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I bet any new radiator would solve the problem.
#21
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Year: 1999
Model: Cherokee (XJ)
Engine: 4.0L
I had rusty crap come out of my radiator the 2 times I flushed it chasing an overheat problem. I had already done EVERYTHING else: Mechanical fan, water pump, thermostat and housing, lower and upper hoses, back flushed the system, used a flushing liquid with distilled water, replaced the head gasket. I did not approach the problem methodically. Before I replaced the radiator, I did two tests which lead me to believe I had a restricted flow through the radiator.
1st I did this...
2nd I did this...
Good luck finding the problem! I ended up buying and installing the inexpensive Car Quest brand single row radiator from Advance. Now, in this south Texas heat, my XJ hangs steady at 205* under any condition. Previously, I had the same trouble you are facing, minus the snow part. ;-)
Todd
1st I did this...
2nd I did this...
Good luck finding the problem! I ended up buying and installing the inexpensive Car Quest brand single row radiator from Advance. Now, in this south Texas heat, my XJ hangs steady at 205* under any condition. Previously, I had the same trouble you are facing, minus the snow part. ;-)
Todd
Last edited by MrTodd; 06-20-2022 at 11:03 AM. Reason: added info
#22
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Thread Starter
- I got a standard replacement CSF radiator. Should be two row. I got a "high flow" thermostat because it's easy to replace and an extra $2 for a high flow part. The thermostat is 180 degree.
- I'm not certain about the torque converter locking up. Not sure how I could verify that. This is going to open up a whole new can of worms, but I've been experiencing a check engine light with code P0740(Torque Converter Clutch Solenoid Circuit/Open Circuit Malfunction) since I got the Jeep last Sept. I tried my hand at diagnosing it for months with no luck. No negative symptoms I've noticed so I've sort of put it on the back burner for now.
- I'm pretty sure my fan shrouds are in place. I've included a few images with this post that should confirm that.
RockAuto receipt for radiator, thermostat, and thermostat housing gasket
Engine bay(front)
Engine bay(drivers side)
Engine bay(passenger side)
- I'm not certain about the torque converter locking up. Not sure how I could verify that. This is going to open up a whole new can of worms, but I've been experiencing a check engine light with code P0740(Torque Converter Clutch Solenoid Circuit/Open Circuit Malfunction) since I got the Jeep last Sept. I tried my hand at diagnosing it for months with no luck. No negative symptoms I've noticed so I've sort of put it on the back burner for now.
- I'm pretty sure my fan shrouds are in place. I've included a few images with this post that should confirm that.
RockAuto receipt for radiator, thermostat, and thermostat housing gasket
Engine bay(front)
Engine bay(drivers side)
Engine bay(passenger side)
#23
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Year: 1989
Model: Comanche (MJ)
Engine: 4.0
I'm not certain about the torque converter locking up. Not sure how I could verify that. This is going to open up a whole new can of worms, but I've been experiencing a check engine light with code P0740(Torque Converter Clutch Solenoid Circuit/Open Circuit Malfunction) since I got the Jeep last Sept. I tried my hand at diagnosing it for months with no luck. No negative symptoms I've noticed so I've sort of put it on the back burner for now.
If you were not getting lockup and no codes, I would suggest say check the brake switch, NSS, and TPS, although that usually causes issues with when it shifts.
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RipPow99XJ (06-23-2022)
#24
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Thread Starter
Hey! I tried driving along highway speeds and applied the break with my left foot. The RPMs did indeed jump up a few hundred. Thank you for the information on testing and replacing the solenoids. Solid advice!
I replaced the radiator and thermostat this past weekend and I've got some good news! The new radiator seemed to fix the problem. I had the A/C cranked and I was really getting into it going up a long patch of interstate from Salt Lake City to Park City(80E). Temp stayed below the tic mark after the 210 mark. This was only going up the steep hill during the test. Before this fix, it would have boiled over and overheated halfway up that stretch. As soon as I crested the top, the temp went back below the 210 mark and stayed that way. I feel pretty confident the new radiator fixed my overheating issue.
On another note, I experienced engine sputtering and a new code on the way back from testing the new parts. P1391 which basically pointed me at the Crankshaft Position Sensor. Got one of those ordered last night. Will be the next new part installed on the XJ.
Thank you all for your help!
I replaced the radiator and thermostat this past weekend and I've got some good news! The new radiator seemed to fix the problem. I had the A/C cranked and I was really getting into it going up a long patch of interstate from Salt Lake City to Park City(80E). Temp stayed below the tic mark after the 210 mark. This was only going up the steep hill during the test. Before this fix, it would have boiled over and overheated halfway up that stretch. As soon as I crested the top, the temp went back below the 210 mark and stayed that way. I feel pretty confident the new radiator fixed my overheating issue.
On another note, I experienced engine sputtering and a new code on the way back from testing the new parts. P1391 which basically pointed me at the Crankshaft Position Sensor. Got one of those ordered last night. Will be the next new part installed on the XJ.
Thank you all for your help!
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