Hey guys...
Been a lurker here for some time. The forum has always been a great resource for DYI repair of my XJ's. Thank you for the all the help in the past.
I've read every one of the hundreds of pages that have the word overheat!
Specifics:
2000 XJ 4.0 - 98k
2010 - Overheating issues:
Replaced Water Pump, Thermostat, Heater Core, Evaporator, Radiator too late to save the head. Truck ran great (couple months) until the head gasket completely went. Parked truck in my garage for 10 months until I had time to pull it apart and replace the head gasket/ head.
Last week:
Replaced 0331 head w/ remanufactured 0331 head. Truck runs perfect for about a half hour and then overheats. Pulled Autozone thermostat, replaced with a Stant, Replaced Rad Cap w/ Stant 16 pounder. The sensor on the thermostat housing reads dead nuts against an IR thermometer and my OBD live reader. Burped the system, started the truck up, filled with more coolant until it wouldn't take any more. Ran it up to 210 on the gauge, shut her down, cooled her off, added more coolant. The typical routine...
Still overheated.
Let her cool off, drained the system down, ran water through every hose and all drained from the lower rad hose bib. Nothing is clogged as far as I can tell. Filled her up w/ plain water... went through the process again... Still overheats after a half hour.
The efan kicks on at 216. Truck hits 255 and check gauge light comes on and it pegs at the 255 mark on the temp gauge.
The oil is fine, no milkshake, there is no exhaust smell in the antifreeze.
At a complete loss here. My next thought is to pull the thermostat all together and see if the truck still overheats.
Any ideas guys?
Thanks!
Frank
Been a lurker here for some time. The forum has always been a great resource for DYI repair of my XJ's. Thank you for the all the help in the past.
I've read every one of the hundreds of pages that have the word overheat!
Specifics:
2000 XJ 4.0 - 98k
2010 - Overheating issues:
Replaced Water Pump, Thermostat, Heater Core, Evaporator, Radiator too late to save the head. Truck ran great (couple months) until the head gasket completely went. Parked truck in my garage for 10 months until I had time to pull it apart and replace the head gasket/ head.
Last week:
Replaced 0331 head w/ remanufactured 0331 head. Truck runs perfect for about a half hour and then overheats. Pulled Autozone thermostat, replaced with a Stant, Replaced Rad Cap w/ Stant 16 pounder. The sensor on the thermostat housing reads dead nuts against an IR thermometer and my OBD live reader. Burped the system, started the truck up, filled with more coolant until it wouldn't take any more. Ran it up to 210 on the gauge, shut her down, cooled her off, added more coolant. The typical routine...
Still overheated.
Let her cool off, drained the system down, ran water through every hose and all drained from the lower rad hose bib. Nothing is clogged as far as I can tell. Filled her up w/ plain water... went through the process again... Still overheats after a half hour.
The efan kicks on at 216. Truck hits 255 and check gauge light comes on and it pegs at the 255 mark on the temp gauge.
The oil is fine, no milkshake, there is no exhaust smell in the antifreeze.
At a complete loss here. My next thought is to pull the thermostat all together and see if the truck still overheats.
Any ideas guys?
Thanks!
Frank