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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
Hey guys , I’ve been trying my best about what’s going on , I have changed My Water Pump , Valve Gasket , Head Gasket , Theromstat , Radiator & Flushed Engine. I’m Still Facing The Car Over heat. I really need help and don’t know what to do. I have 1 Mechanical Fan & 3 Electric Fans
The fans where installed by the previous owner? What did the coolant look like before the flush?
What condition is the radiator cap in?
Why did you change the head gasket? Assuming the gauge is accurate and you have purged the system of air, look through the oil fill cap for the 0331 head crack. Perform a CO2 Block test to rule out exhaust gas in the coolant. Does the coolant boil in the overflow tank? Do you have coolant in the overflow tank?
Sarah, the stock cooling system should be able to handle normal operation without a bunch of extra stuff (like additional fans).
Start with the check for the 0331 head defect. It's likely that the "head gasket" repair was done by someone who didn't properly check for this well known problem with 00-01 XJ's and assumed the head was fine. I think Cummins mentioned one check, so do that, if you see any "milkshake" or green in the oil - that's indicative of the head crack.
A lab test is an option, but in your case it's not going to be helpful. Whatever is wrong with the engine is probably severely wrong and should be visibly obvious.
Another sign of the 0331 problem is a reduction in oil pressure - how's yours?
If it is NOT the 0331 head defect (and like Cruiser, my gut feeling is that it is), then get rid of the extra fans. As mentioned, they could be blowing the wrong way, they're probably restricting airflow... use a Mopar thermostat, flush the coolant, make sure the fan clutch is good, etc.
IF IT IS the cylinder head, there are 2 good options. The later "TUPY" head from Chrysler and the "Clearwater" head from Odessa Cylinder Heads in FL. Both are around $500. You can get a used "TUPY" from a junkyard, but by the time you recondition it, it'll cost about the same.
The 0331 head was introduced in 99 in the Grand Cherokee and in 2000 in the Cherokee and Wrangler and had a casting defect that causes them to crack, not always, but quite often. The "TUPY"
head was installed on the 4.0 in the mid 02 and later models to fix this problem, although Chrysler never acknowledged there WAS a problem!
Hey guys , okay so first of all the 2 fans are pulling air from outside to the engine ‘ installed behind the grill ‘
the head was taken to turning and I have changed it because there was no other reason for it to over heat after I’ve changed every part possible , as for the cylinder head I don’t think it’s bad because there is no smoke and no lose of oil from the engine .
The radiator cap is perfect and it only leaked when it over heats due to very very high pressure , the coolant is not mixed with any other substances like oil or whatever.
And yes my car over flows from the tank
I’ve taken it to a mechanic and he said to turn on the car while the radiator cap is open , if it has bubbles it would show that the head is blown out and there was no bubbles at all. I’ve taken it to 4 mechanics and no one has any idea of what to do !
Fyi guys , the temp in this country is around ‘ 40-45*c ‘
ive spent just too much on the car and now I’m hopeless.
Too much guessing. Look for the crack with the engine off and running. Look straight down into the oil fill cap look around the rocker pedestals as well. Buy a block tester and fluid perform the test. Put a little extra fluid in a clear shot glass. Hold both of them up to the light to contrast the difference. Simply looking into the radiator fill neck is not enough and is poor advice. A new quality radiator cap is cheap and an easy rule out. Rad caps can look fine and still be weak or failed.
I’ll try to get another cap although this was original. But worth the try.
And I’ll try to find out where I could buy the combustion tester as we don’t have it here in dubai. It’s killing me !
This picture was after 5 mins of the car on , and after 10 mins it went up to 260 and over heated. Bubbles off the coolant res & radiator cap had so much pressure it started to leak.
Hey guys , okay so first of all the 2 fans are pulling air from outside to the engine ‘ installed behind the grill ‘
the head was taken to turning and I have changed it because there was no other reason for it to over heat after I’ve changed every part possible , as for the cylinder head I don’t think it’s bad because there is no smoke and no lose of oil from the engine .
The radiator cap is perfect and it only leaked when it over heats due to very very high pressure , the coolant is not mixed with any other substances like oil or whatever.
And yes my car over flows from the tank
I’ve taken it to a mechanic and he said to turn on the car while the radiator cap is open , if it has bubbles it would show that the head is blown out and there was no bubbles at all. I’ve taken it to 4 mechanics and no one has any idea of what to do !
Fyi guys , the temp in this country is around ‘ 40-45*c ‘
ive spent just too much on the car and now I’m hopeless.
Wow, 4 mechanics?!? The coolant system on the XJ is pretty simple - there's no magic or complex things going on.
It just occurred to me, I had an overheating experience that was crazy - I'd be shocked if you had the same issue, but I'll throw it out there.
I was driving my 2000 TJ on a road trip and well into the trip, the Jeep overheated so badly it blew out the radiator (the seam between the plastic tank and metal body was a common issue). So on the side of the road, hundreds of miles from home I replaced the radiator. It still overheated quickly - like I couldn't run the engine for more than a couple minutes from a cold start without it exceeding 210F (the middle of the gauge). Being exhausted, I had it towed to a shop that said "fan clutch".. replaced that, still overheating. Had some other stuff done (long story) but basically drove off and lo and behold, STILL f'n overheating. At a total loss, on the side of the road (again), I decided to pull the water pump. Bear in mind, I'd replaced it under a year prior.
Turns out, the freaking impeller (the part that moves the coolant) had sheared off the shaft. So although the pump was spinning, the bearing was smooth and quiet and there was no seepage from the weep hole (all the 'typical signs of a water pump failure), if the coolant isn't moving, the heat won't be dispersed and voila - rapid overheating.
Ironically, that engine still runs like a dream with the OEM 0331 head and over 300k on the clock.
In short, verify the coolant is cycling. A clogged radiator or failed water pump (being "new" does not guarantee it's not broken) will lead to massive overheating.
If it's only happening at a stop or in traffic, it is most likely your fan clutch. I would check that first. Mine overheated recently, I thought it was the water pump, but just ended up wasting money. Turned out the fan clutch wore out
Hey guys so as I’ve said , I’ve changed all the parts from radiate to water pump theromstat fan clutch head gasket valve gasket and today I’ve added new radiator pipes and fan covers , I hope this works for the next couple of days I’ll update you. And thank you guy everyone for trying to help means a lot!
09-11-2019, 11:33 PM
Jeep Xj 2000 OVERHEATING !
