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  #13  
Old 04-30-2013, 05:57 AM
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Thats alot text for something I said earlier lol
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  #14  
Old 04-30-2013, 06:05 AM
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Re: significant overheat 4.0. diag?

thanks for all the insight.

Jeep is at shop to have new thermostat and rad cap installed. They will flush and fill the cooling system including heater core. I will report back with further diagnosis.
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Old 04-30-2013, 09:25 AM
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Re: significant overheat 4.0. diag?

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Originally Posted by xJoshxx View Post
Thats alot text for something I said earlier lol
Yes it is, but some people are on here to learn a bit, so some explanation on how and why is nice. Starting trouble shooting with the wrong idea how a system works, could lead to wrong conclusions.
At least i like to learn every day a bit more, eventhough i know that many people only want a solution and don't care about the reasons behind it.
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  #16  
Old 04-30-2013, 12:05 PM
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Re: significant overheat 4.0. diag?

Spoke with shop. Water pump has propeller shaft crack. The pump was replaced by past owner but apparently cracked under the stress I put it through. Head gasket did not show signs of failure after dye test. Thanks all will report back with performance update.
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Old 04-30-2013, 03:09 PM
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Re: significant overheat 4.0. diag?

Quote:
Originally Posted by Frango100 View Post
Yes it is, but some people are on here to learn a bit, so some explanation on how and why is nice. Starting trouble shooting with the wrong idea how a system works, could lead to wrong conclusions.
At least i like to learn every day a bit more, eventhough i know that many people only want a solution and don't care about the reasons behind it.
That's all I was trying to do was learn. My Haynes manual doesn't explain that the heater hose is "before" the thermostat and part of the water jacket system. The way it's drawn up and looks on the Jeep is that it's "after" the thermostat and would only get new coolant when the thermostat is opened. Thanks.
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Old 05-03-2013, 09:29 PM
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Quote:
Originally Posted by kgingerich View Post
Spoke with shop. Water pump has propeller shaft crack. The pump was replaced by past owner but apparently cracked under the stress I put it through. Head gasket did not show signs of failure after dye test. Thanks all will report back with performance update.
Please purchase a metal squirrel cage water pump not plastic. I did this and i am worry free.

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Old 05-04-2013, 12:18 PM
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Re: significant overheat 4.0. diag?

If the cooling system is full and your not blowing hot air either A) your heater core is plugged and is not helpful in diagnosing your symptoms. B) you have no coolant flow. Dependant on the replaced water pump, there is a possiblility the impeller has broken free from the shaft so it is not actually moving any coolant. This is not something I have ever heard of or seen on an OE pump but I wouldnt put it past an aftermarket pump (for the 4.0l, VERY common on some cars like vw 1.8T's). Considering you had the stuck throttle and really high rpms this is going to be the highest force put on the impeller. All that said its just a theory. If its overheating and your hoses are not getting hot (all of them, heater and radiator) you have no flow and I would go straight to the water pump.

Also as frank said, heater core flow is not regulated by the thermostat, otherwise it would only blow hot air when the thermostat allowed, the thermostat is bypassed for heater core flow so you have hot coolant flowing through it at all times.
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  #20  
Old 05-05-2013, 08:46 PM
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Re: significant overheat 4.0. diag?

Thanks for the imput 05 JGC. After water pump, thermostat, cap and heater core flush I was up and good. Heat was warmer than ever good steady temp. This is a Napa brand water pump so probably not full steel cage. I don't plan on redlining this one, it has 1 yr wrrty. I am leaking some coolant from upper passenger side of radiator though. This would explain lower crowl being covered before. $ says ill be replacing the rad in my garage. Not looking forward to it sounds pretty tight. Inlet hose to water pump is tight and dry all other hoses are fine. Don't believe there are any other lines on pass side upper radiator. (No tranny cooler or hitch) so I believe the oem rad is ready for a swap. 160k.

Thanks all.
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