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post #1 of (permalink) Old 01-03-2012, 04:25 PM Thread Starter
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overheating 97 Cherokee

I have a 97 Jeep Cherokee with the 4.0L six that tells me it's overheating even after new thermostat, new temp sensor and new radiator. any ideas? I've expired mine!
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post #2 of (permalink) Old 01-03-2012, 05:46 PM
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Just the new guy but...

I am just the new guy on here but it sounds like you have tried many of the main obvious things. Does it over heat on the highway or just when it is sitting? It could have a bad electric cooling fan/relay if it only over heats whin sitting and not when moving. If it over heats on the open road it could be a blown head gasket. If the overflow jug is plum full (like way over full "I didnt fill it that full" full) then it might be pumping the block full of air and causing it to over heat. If you have replaced the thermostat and radiator, that is the direction I would look. Let me know how you turn out, I hope I was of some help.
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post #3 of (permalink) Old 01-04-2012, 08:14 AM Thread Starter
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Overheating Jeep

Thanks for the suggestion, I've been wondering about a head gasket issue because it has an intermittent rough running problem to. I don't have the coolant in the oil symptom though. The upper radiator hose gets so full that I can't squeeze it together which is why I replaced the radiator, I thought it was backing up because it was clogged.
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post #4 of (permalink) Old 01-05-2012, 09:30 PM
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Not good news but...

I know that this is probibaly not welcomed news but it is strongly looking like the head gasket is blown. I have seen the heads crack between 3&4 you could see antifreze in the crack just under the oil cap. Not saying its common but I have seen it more than once. If the gasket is blown between a cylender and a water jacket you wont get oil. That happens when it blows between a water jacket and an oil passage. The cylender has much higher pressures than the cooling system when it is lighting off which could explain why you ane not burning any coolant. It is just pumping exaust gas into the cooling system. How quickly does the upper hose build pressure? If it is fairly quickly and or before the thermostat opens that makes the case for a blown head gasket even stronger.
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