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MN_wjLIMITED 09-30-2013 05:02 AM

wj cooling issue?
Hey I'm new to jeep garage and seek help. I have a 99 4.7 limited and am having a hard time figuring out why it overheats a tad every couple weeks. To start it has a new radiator, t-stat, water pump, hoses, timing cover(used but not worn out too bad). Ill bleed the system and everything is good but every couple weeks it will get around 240ish in traffic and drop when I drive, check coolant and I have too add. It doesnt leak and a pressure test was good and the oil is clean.... almost forgot there is still a lot of pressure released even a few hours after sitting when I pull the cap off but the level in the overflow bottle is full and never changes. Any help would be great because this thing has me confused. Thanks

Frango100 09-30-2013 08:48 PM

Re: wj cooling issue?
Welcome to the garage.
You made me confused: first you say that you have to add coolant, then you say that the level in the overflow reservoir never changes:eek:.
There seems to be a problem with the cooling fan, or does it run when the high temperature is reached?
Are you absolutely sure that no coolant is seaping away from some hot place, but evaporating? No coloured signs anywhere?

MN_wjLIMITED 09-30-2013 09:01 PM

Sorry I should have said the overflow never changes but the radiator it self has to be filled. I cant see any signs of anything which is the confusing part.

Frango100 09-30-2013 09:17 PM

Re: wj cooling issue?
Overflow reservoir at right level and radiator low means some leak in the cooling system. When the engine cools down, an underpressure is created, which should draw coolant back from the overflow reservoir. A small check valve in the radiator cap should allow this. When you didn't change the radiator cap yet, i would do that first.

MN_wjLIMITED 09-30-2013 09:18 PM

Just did tonight so ill give it a few days and see where its at

Frango100 10-01-2013 06:38 PM

Re: wj cooling issue?
Ok, let us know when its ok (or not:().

MN_wjLIMITED 10-02-2013 01:01 AM

Will do, leta hope this solves it

MN_wjLIMITED 10-07-2013 07:47 PM

Going on 5 days no issues but im going to give it another week or so.

Frango100 10-07-2013 09:17 PM

Re: wj cooling issue?
Ok, keep us in the loop.

MN_wjLIMITED 10-16-2013 09:49 PM

Well two weeks in and im going to report no issues still so im calling it good to go.

Frango100 10-17-2013 09:44 AM

Re: wj cooling issue?
Good to hear, nothing better then a simple (and cheap) solution:D.

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