cooling issues
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- Location
- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
ok first off im not sure if this should go here or in a different part of the forum.
i spent the whole weekend working on a 83 CJ7 with a ford 5.0 out of a 87 mustang gt.
so heres the run down. the jeep was a running driving and wheeling vehicle when the restoration began. the motor was not rebuilt but did have all new parts put on (i.e dist. headers, water pump, fuel pump/tank, radiator, etc, etc, etc). the motor starts and runs just fine is timed right and idles great.
the problem is it over heats i have replaced the water pump twice and the thermostat 4 times now these were all stant brand (trying different temps 195, 180, etc). this last time to verify everything was working and to eliminate problems i ran it with out the thermostat to make sure the water pump was indeed working and flowing in the right direction. (it is) without the thermostat in it ran fine for hours on end and floated around 180 with the fan on. so i know it is flowing and cooling with no blockages. (i also took the time to flush the whole system just in case dirt and or random things got clogged during the build). while this was being done i took my newest thermostat (mr gasket brand 180 degree) and put it in a pan of water and slowly warmed it on the stove with a thermometer in it to verify that it does indeed open and operate at the right temp. (surprise it does like its so pose to)
so with the system fully flushed perfectly clean and clear water running out no signs of dirt, old coolant or anything else for that matter and the engine running fine and at the right temp (with out the thermostat). i proceeded to install the latest thermostat which like i said has been verified as working via pot of water on the stove. once everything was back in place and system filled up again i fire it up and low and behold it is still doing the same thing... over heating. it acts like the hot coolant wont flow into or through the radiator (all air bubbles have also been removed as well). also before it is mentioned yes the thermostat is in the correct way i figure i will save a few people from typing that one.
im at a loss here like i said it works fine without the thermostat but as soon as its in it over heats but i know its open as the upper hose and side of the radiator gets hot. im open to any and all suggestions here its really got me puzzled the obvious answer is the thermostat is not working but i know it is. heres a pic of the jeep its not the best but then again the pic wont really show the problem.
thank you in advance for any advice you may have for me
i spent the whole weekend working on a 83 CJ7 with a ford 5.0 out of a 87 mustang gt.
so heres the run down. the jeep was a running driving and wheeling vehicle when the restoration began. the motor was not rebuilt but did have all new parts put on (i.e dist. headers, water pump, fuel pump/tank, radiator, etc, etc, etc). the motor starts and runs just fine is timed right and idles great.
the problem is it over heats i have replaced the water pump twice and the thermostat 4 times now these were all stant brand (trying different temps 195, 180, etc). this last time to verify everything was working and to eliminate problems i ran it with out the thermostat to make sure the water pump was indeed working and flowing in the right direction. (it is) without the thermostat in it ran fine for hours on end and floated around 180 with the fan on. so i know it is flowing and cooling with no blockages. (i also took the time to flush the whole system just in case dirt and or random things got clogged during the build). while this was being done i took my newest thermostat (mr gasket brand 180 degree) and put it in a pan of water and slowly warmed it on the stove with a thermometer in it to verify that it does indeed open and operate at the right temp. (surprise it does like its so pose to)
so with the system fully flushed perfectly clean and clear water running out no signs of dirt, old coolant or anything else for that matter and the engine running fine and at the right temp (with out the thermostat). i proceeded to install the latest thermostat which like i said has been verified as working via pot of water on the stove. once everything was back in place and system filled up again i fire it up and low and behold it is still doing the same thing... over heating. it acts like the hot coolant wont flow into or through the radiator (all air bubbles have also been removed as well). also before it is mentioned yes the thermostat is in the correct way i figure i will save a few people from typing that one.
im at a loss here like i said it works fine without the thermostat but as soon as its in it over heats but i know its open as the upper hose and side of the radiator gets hot. im open to any and all suggestions here its really got me puzzled the obvious answer is the thermostat is not working but i know it is. heres a pic of the jeep its not the best but then again the pic wont really show the problem.
thank you in advance for any advice you may have for me
You say it runs fine W/O a t'stat.
