StimitheJoop
NAXJA Forum User
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Okay 1993 cherokee, 4.0, manual, electric fan converted, turbocharged, edelbrock head are the main modifications to keep in mind with the following.
My headgasket was leaking so I replaced it and my head covering my bases. I measured and triple checked my deck was flat prior to assembly. Got it all together and did the first run heat cycle and this thing got hot fast. I let ot get up to 220 indicated on the gauge and shut it down. Let it cool off and did my retorque. Got all the air out of the system but still couldnt keep it cool for longer than probably 4 minutes before shutting it down.
It has an entire new cooling system; new water pump flowcooler high volume of the correct rotation orientation for xjs, mishimoto radiator, new hoses, new thermostat, new sending units for temps.
So after that. Fed up with stimi the unquenchable, I removed my upper and lower rad hoses and flowed water through the radiator and it was good. Then attached the lower rad hose and let it flow through the entire block, up and out the water neck and the flow was severly reduced. I then took off the thermostat housing and watched the water flow through the head and it was fine.
Okay bad thermostat? Changed it again and ran it with the hose still feeding the cooling system and same exact issue. Disconnected the bypass hose that feeds the heater core and that allowed coolant to flow enough to not overheat!?
So im at a loss as to what to think with any certainty. I have vauge guess of a lack of flow to the rear of the block?? I have verified that rear sensor is correct with a temp gun and having a boiling occure.
Or somehow could it be still a water pump pressure issue? I have no frame of reference to know if what i have for pressure is good or not but it was equal to a lazy faucet at idle and some good distance at rpm!
Super weird, cant wait for some good input as im so lost
My headgasket was leaking so I replaced it and my head covering my bases. I measured and triple checked my deck was flat prior to assembly. Got it all together and did the first run heat cycle and this thing got hot fast. I let ot get up to 220 indicated on the gauge and shut it down. Let it cool off and did my retorque. Got all the air out of the system but still couldnt keep it cool for longer than probably 4 minutes before shutting it down.
It has an entire new cooling system; new water pump flowcooler high volume of the correct rotation orientation for xjs, mishimoto radiator, new hoses, new thermostat, new sending units for temps.
So after that. Fed up with stimi the unquenchable, I removed my upper and lower rad hoses and flowed water through the radiator and it was good. Then attached the lower rad hose and let it flow through the entire block, up and out the water neck and the flow was severly reduced. I then took off the thermostat housing and watched the water flow through the head and it was fine.
Okay bad thermostat? Changed it again and ran it with the hose still feeding the cooling system and same exact issue. Disconnected the bypass hose that feeds the heater core and that allowed coolant to flow enough to not overheat!?
So im at a loss as to what to think with any certainty. I have vauge guess of a lack of flow to the rear of the block?? I have verified that rear sensor is correct with a temp gun and having a boiling occure.
Or somehow could it be still a water pump pressure issue? I have no frame of reference to know if what i have for pressure is good or not but it was equal to a lazy faucet at idle and some good distance at rpm!
Super weird, cant wait for some good input as im so lost