1992 Jeep 4.0 AX15 NP242 with around 2k miles on rebuild. Started having issues after the rebuild that've gotten progressively worse. Running at 230 with A/C on in 90 degree weather. Would probably go higher but I shut it down and flip on the heat. I just need somewhere else to look. Here's the stuff I've done already:
Rebuilt Motor running 5w40 T6 oil
New CSF 3 core radiator (put water through it before install just to double check flow)
2 195 degree thermostats and now a 180
New Thermostat Housing
On 3rd water pump with no signs of failure on the previous two when pulled
New radiator hoses
Deleted the heater valve and running straight to the heater core
50/50 coolant (added coolant specific UV dye to ensure no leaks)
New Mopar coolant sensor (ran a couple others but no change)
Exhaust is brand new and no leaks
A/C condenser was cleaned
ZJ cutch fan
Later model electric fan on a switch running constantly
New belt and pulleys
I have an aux temp gauge I'm going to hook up this weekend to double check against my stock gauge
The only things I can think of is maybe my coolant overflow is blocked (not sure how to test/clear it) and my A/C compressor clutch is old but operational. I thought maybe it was causing drag not letting the water pump flow 100% but it'll hit close to 230 even without the A/C. I've had the system pressure tested at a shop no dice. Leak down and pressure test on the cylinders after the rebuild. Any idea's or guidance would be appreciated. I know enough to do most the work myself with the exception of rebuilding the motor/trans. I've pulled AX15s to do clutch work in the past and completely rebuilt my 242 before installing so not completely mechanically stupid hahaha. Thanks again.
Rebuilt Motor running 5w40 T6 oil
New CSF 3 core radiator (put water through it before install just to double check flow)
2 195 degree thermostats and now a 180
New Thermostat Housing
On 3rd water pump with no signs of failure on the previous two when pulled
New radiator hoses
Deleted the heater valve and running straight to the heater core
50/50 coolant (added coolant specific UV dye to ensure no leaks)
New Mopar coolant sensor (ran a couple others but no change)
Exhaust is brand new and no leaks
A/C condenser was cleaned
ZJ cutch fan
Later model electric fan on a switch running constantly
New belt and pulleys
I have an aux temp gauge I'm going to hook up this weekend to double check against my stock gauge
The only things I can think of is maybe my coolant overflow is blocked (not sure how to test/clear it) and my A/C compressor clutch is old but operational. I thought maybe it was causing drag not letting the water pump flow 100% but it'll hit close to 230 even without the A/C. I've had the system pressure tested at a shop no dice. Leak down and pressure test on the cylinders after the rebuild. Any idea's or guidance would be appreciated. I know enough to do most the work myself with the exception of rebuilding the motor/trans. I've pulled AX15s to do clutch work in the past and completely rebuilt my 242 before installing so not completely mechanically stupid hahaha. Thanks again.