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  #13  
Old 05-14-2013, 06:02 AM
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Re: Radiator Leak

thanks frank. Yep, while cooled completely i opened cap and poured maybe 1/2 qt more coolant into radiator, and it was full once again, capped it. Been great so far. The fittings on the transmission cooler lines were identical to OEM and i don't anticipate any seepage.
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  #14  
Old 05-14-2013, 08:13 AM
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Re: Radiator Leak

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Originally Posted by Frango100 View Post
Its.always a good idea to change thermostat, hoses and radiator cap at the same time.
For anyone who reads this in the future, I would also add to the list to change out the serpentine belt. It's roughly a $20 belt and much easier to change when the radiator is out of the way.

I changed my radiator and left the thermostat in place for a couple reasons. First was that the Jeep had less than 100k miles and the thermostat should be find for many more miles. Second and most important, due to the location of the thermostat on the 4.0L engine it's no more difficult to change with the radiator in place.
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Old 05-14-2013, 12:02 PM
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Re: Radiator Leak

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Originally Posted by JeepMe View Post
For anyone who reads this in the future, I would also add to the list to change out the serpentine belt. It's roughly a $20 belt and much easier to change when the radiator is out of the way.

I changed my radiator and left the thermostat in place for a couple reasons. First was that the Jeep had less than 100k miles and the thermostat should be find for many more miles. Second and most important, due to the location of the thermostat on the 4.0L engine it's no more difficult to change with the radiator in place.
Eventhough that can be true, you will not be able to flush the engine properly with the thermostat in place. So because you already have to remove it for that purpose, you can save time and coolant by changing it out now. If its in place since new, then it has done a good job already.
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  #16  
Old 05-14-2013, 08:03 PM
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Re: Radiator Leak

Got all my parts in today, will change it out tomorrow. Do any of you use RTV on the thermostat housing?
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  #17  
Old 05-16-2013, 12:42 PM
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Re: Radiator Leak

So I changed out the radiator, thermostat, thermostat housing and hoses. I cleaned and installed a new gasket on the housing but it's leaking from the housing. Did not use RTV... What do you think?
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Old 05-16-2013, 01:22 PM
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Re: Radiator Leak

PS leak doesn't happen with radiator cap off. Only with cap installed. Also with both heat on and off.
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Old 05-16-2013, 09:54 PM
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Re: Radiator Leak

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Originally Posted by Frango100 View Post
Eventhough that can be true, you will not be able to flush the engine properly with the thermostat in place.
True. I guess I'm just not bought into the whole idea of you need to flush your coolant system with back pressure. All the vehicles I've owned end up being HIGH mileage and I've never done anything more then drain everything and refill with new (which can be done w/out removing the thermostat). Different strokes, different folks.
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Old 05-17-2013, 09:06 AM
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Re: Radiator Leak

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Originally Posted by 04JGCSpecialEdition View Post
PS leak doesn't happen with radiator cap off. Only with cap installed. Also with both heat on and off.
The reason that it leaks with the radiator cap installed is that it will build up around 18 PSI of pressure, so you will have more change to discover a leak then. When you are sure its leaking from the gasket, a little RTV or liquid gasket on the gasket faces should solve that.
Heat on or off should not make any difference, since the coolant always flows through the heater core.
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