alex673
NAXJA Forum User
- Location
- Western Australia
Hey guys. I surmise this subject has been done to death, so please be patient!
I have a '95 XJ Limited/Classic 4.0L HO, AW4,NP242,Dana 30s. Virtually stock.
About 18 months ago my xj overheated while on a highway at 100km/hr. Turns out I split the radiator tanks. I replaced the radiator with an aftermarket Jeep one with steel tanks, replaced the thermostat and filled the radiator with new coolant. Had it pressure tested, and there were no other leaks.
A few months later, the water pump started leaking. It was stuffed, so I replaced it.
Anyway, a couple of days ago, my xj overheated again. I was losing coolant at a rapid rate, but can't tell exactly from where. I have checked the water pump, and that seems to be part of the problem. There is a small amount of coolant coming from there, so I will replace that again.
Anyway, the bulk of the coolant loss seems to be coming from the right hand side in the centre of the engine bay somewhere, but I can't tell due to the exhaust etc in the way.
Also, when running at normal temperature, the needle suddenly goes to the red zone. Not gradually, but within a couple of seconds.
Could I have slightly warped or cracked the head when it first overheated 18 months ago, and now that it's overheated again, could that have finished warping or cracking it???
Sorry for such a long post, but I think that with all this information, it should make it easier to diagnose.
Thanks in advance.
I have a '95 XJ Limited/Classic 4.0L HO, AW4,NP242,Dana 30s. Virtually stock.
About 18 months ago my xj overheated while on a highway at 100km/hr. Turns out I split the radiator tanks. I replaced the radiator with an aftermarket Jeep one with steel tanks, replaced the thermostat and filled the radiator with new coolant. Had it pressure tested, and there were no other leaks.
A few months later, the water pump started leaking. It was stuffed, so I replaced it.
Anyway, a couple of days ago, my xj overheated again. I was losing coolant at a rapid rate, but can't tell exactly from where. I have checked the water pump, and that seems to be part of the problem. There is a small amount of coolant coming from there, so I will replace that again.
Anyway, the bulk of the coolant loss seems to be coming from the right hand side in the centre of the engine bay somewhere, but I can't tell due to the exhaust etc in the way.
Also, when running at normal temperature, the needle suddenly goes to the red zone. Not gradually, but within a couple of seconds.
Could I have slightly warped or cracked the head when it first overheated 18 months ago, and now that it's overheated again, could that have finished warping or cracking it???
Sorry for such a long post, but I think that with all this information, it should make it easier to diagnose.
Thanks in advance.
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