Looking for mopar oe radiator

[Jerry Bransford]

How does one re install this bolt to have the exact tension as it had before?

Adjust it so you can barely deflect the serpentine belt 1/2" when pushing hard on it with your thumb at the midpoint of its widest unsupported length.

Loosen the bolt going through the center of the idler pulley before trying to loosen the adjustment screw. That pulley moves up/down in a slot when adjusting the belt tension.

 

[Ejforan]

I have found the problem. Today I replaced the lower hose and upper as well while I was at it. Still dripping coolant a little so I can’t think of anything else besides the water pump to be the problem. Side note is there any easy way to bleed the system out without an actual bleeder?

 

[zebra12]

Side note is there any easy way to bleed the system out without an actual bleeder?

I use one similar to this:

https://www.amazon.com/dp/B01I40ZQWE/?tag=wranglerorg-20

 

[Jerry Bransford]

TJ cooling systems will eventually bleed the air out on their own. Which is probably why the Mopar Factory Service Manual doesn't include instructions on bleeding the cooling system.

 

[Ejforan]

TJ cooling systems will eventually bleed the air out on their own. Which is probably why the Mopar Factory Service Manual doesn't include instructions on bleeding the cooling system.

That is a great thing to know so I don’t spend more time than I need on that.

 

[mrblaine]

I have found the problem. Today I replaced the lower hose and upper as well while I was at it. Still dripping coolant a little so I can’t think of anything else besides the water pump to be the problem. Side note is there any easy way to bleed the system out without an actual bleeder?

If the thermostat doesn't have the equivalent of a 1/8" hole near the top in the flange, it will be hard to bleed. If it does, it will be very easy.

 

[Camhabib]

If the thermostat doesn't have the equivalent of a 1/8" hole near the top in the flange, it will be hard to bleed. If it does, it will be very easy.

When I installed my Stant thermostat, I don’t recall it having a hole. Is it worth removing, modifying, and reinstalling at this point or just leave it be since it’s been running fine for a while now?

 

[mrblaine]

When I installed my Stant thermostat, I don’t recall it having a hole. Is it worth removing, modifying, and reinstalling at this point or just leave it be since it’s been running fine for a while now?

Easy rule to remember. It works until it doesn't. If it works, leave it alone. If it doesn't, fix it until it does. The system is self bleeding until it isn't. When it isn't, that is usually due to the bleed hole in the thermostat being a problem. If it doesn't blow coolant out of the radiator right before the thermostat opens when you are filling it, it will generally bleed just fine. If it does, stop, drill the flange and put it all back together.

 

[CheX07]

Hi,

I am sort of in the same situation right now. I have a 99 4.0L with auto transmission, for which I think the "correct" part is 5202983AA as OP stated.

OP, can you please share what did do at the end? Did you get either 55037653AB or AC? Or did you end up not swapping it?

If anyone else can confirm that I can fit a 55037653AB or AC in my TJ, I would really appreciate it!

Thanks!