over heating 1994 cherokee sport ?
08-27-2018, 11:27 AM
#1
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Year: 1994
Model: Cherokee (XJ)
Engine: v6 4.0 ohv
over heating 1994 cherokee sport ?
hey guys i recently bought a used motor from a junk yard and the motor runs cool on the freeway but it over heats while idling , i just put a new radiator in when i put the motor in , it has a new water pump ?
08-27-2018, 01:45 PM
#3
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Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
Fan clutch as Martlor13 says and a new thermostat while you're at it. My 95 had a slight overheating at idle when I first got it and the fan clutch and t-stat cured it nicely.
08-28-2018, 12:29 PM
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Year: 1994
Model: Cherokee (XJ)
Engine: v6 4.0 ohv
i got a fan clutch from oreilys and it still over heats . it was in the red box but it didnt hit 260
08-28-2018, 12:31 PM
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Year: 1994
Model: Cherokee (XJ)
Engine: v6 4.0 ohv
i put a fan clutch from oreilys and it still is over heating it goes to the red box ? im thinking maybe a cracked head ?
09-05-2018, 07:15 PM
#7
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Cracked head would be either water in the oil or Water blowing out of the radiator, I would think. Only overheating at Idle is probably poor circulation (Bad pump or crud in the engine). Could be the fan clutch also.
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09-05-2018, 11:07 PM
#8
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Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
260 is really hot.
Just a bad fan clutch alone (unless it's completely failed) is not enough to run that hot.
First step is to verify the temp with an IR gun - they're relatively inexpensive and a useful tool to have in your toolbox.
Assuming it's legitimately running too hot, I would immediately get an oil analysis from Blackstone labs on the engine. In the meanwhile I would pull the water pump and t-stat off and flush the heck out of the engine. Make sure the pump is good and put a new t-stat in it.
Good luck and keep us posted!
Just a bad fan clutch alone (unless it's completely failed) is not enough to run that hot.
First step is to verify the temp with an IR gun - they're relatively inexpensive and a useful tool to have in your toolbox.
Assuming it's legitimately running too hot, I would immediately get an oil analysis from Blackstone labs on the engine. In the meanwhile I would pull the water pump and t-stat off and flush the heck out of the engine. Make sure the pump is good and put a new t-stat in it.
Good luck and keep us posted!
09-06-2018, 02:32 PM
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radiator pressure tester.
09-07-2018, 10:01 AM
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Year: 1994
Model: Cherokee
Engine: 4.0
be sure to run a 195* thermostat any lower and it will overheat because the water will not get to stay in the radiator long enuff to cool
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