Open system leak

[Tburercomanche]

I drive back and forth from home and work(I don't get out of 3rd gear) and sometimes the hose coming from my radiator cap leaks alot. Ive replaced the thermostat and water pump recently. And should I have a tank for the hose coming off the cap. It's a 4.0L

[DirtyComanche]

Yeah, that needs to go to an overflow bottle so the coolant in captured and returned to the system when it cools down. If I'm understanding you right, that is.

[dustyinthedirt]

I think that you should have a over flow bottle that can catch that. 

 

https://www.amazon.com/Crown-Automotive-52003213-Coolant-Bottle/dp/B00BA7A0G6

 

You will need a cap to. sold separate of course.

 

https://www.amazon.com/Crown-Automotive-J3223202-Coolant-Bottle/dp/B00B8X67FU

 

try hooking that up and see if it helps

[DirtyComanche]

I think that you should have a over flow bottle that can catch that. 

 

https://www.amazon.com/Crown-Automotive-52003213-Coolant-Bottle/dp/B00BA7A0G6

 

You will need a cap to. sold separate of course.

 

https://www.amazon.com/Crown-Automotive-J3223202-Coolant-Bottle/dp/B00B8X67FU

 

try hooking that up and see if it helps

That's the 2.5L bottle?

[dustyinthedirt]

http://www.partsgeek.com/9f86v58-jeep-cherokee-expansion-tank.html?utm_source=shoppingcom&utm_medium=pf&utm_content=dcs&utm_campaign=PartsGeek+ShoppingCom&fp=pp&utm_term=Jeep+Expansion+Tank

 

i had them both open and copied the wrong one.  :thumbsup: the 2.5 bottle looks conveniently small though. I'm not real happy with how mine is against the firewall mounted where the old pressure bottle was.

any suggestions on that? since it does go along with this thread. 

[DirtyComanche]

http://www.partsgeek.com/9f86v58-jeep-cherokee-expansion-tank.html?utm_source=shoppingcom&utm_medium=pf&utm_content=dcs&utm_campaign=PartsGeek+ShoppingCom&fp=pp&utm_term=Jeep+Expansion+Tank

 

i had them both open and copied the wrong one.  :thumbsup: the 2.5 bottle looks conveniently small though. I'm not real happy with how mine is against the firewall mounted where the old pressure bottle was.

any suggestions on that? since it does go along with this thread.

Pretty certain the 2.5L bottle fits great (and where it should have been, the 4L HO is in a really stupid place) as long as you run an aftermarket airfilter and no airbox, or swap in the 2.5L airbox (not sure if that's feasible, not a great idea either way).

 

I completely forgot about the 2.5L bottle and built an insane mount for the 4L HO one for my XJ, since you can't put it where Chrysler did if you have a Renix (your coil and ICM is there).

 

I should order one for my MJ and see if I can make it fit, because it's got a goofy one up where the old pressure bottle was, and it offends me.

[ParadiseMJ]

Triple Post...damn phone.

[ParadiseMJ]

delete please .  tri-post

[ParadiseMJ]

I snagged an overflow bottle out of a Nissan a the yard. Really any decent sized bottle will work IF you can find a convenient place to put it. Remember the line from the rad cap goes in the bottom, there's virtually zero pressure held in the overflow tank, when the coolant in the engine expands it goes into the overflow and when the engine cools off it gets sucked back into the rad. Otherwise you're just pissing coolant onto the ground. Have a good tight connection at the radiator and at the tank. When you check the level hot it should be slightly fuller than when cold. Never open the cap when hot.

[Rockfrog]

My first overflow bottle was a fast orange bottle with some brake line plumbed accordingly. Worked fine for a year and a half before I replaced it with one from a 92 Cherokee.

 

 

Sent from my SGH-I337M using Tapatalk

[dustyinthedirt]

thats a great idea!  :thumbsup:

[Tburercomanche]

So the line needs to stick clear down in the bottom of the bottle so it can suck it back out right?

[Jargon]

So the line needs to stick clear down in the bottom of the bottle so it can suck it back out right?

 

 

On the factory bottles, there's two lines - one on top for the overflowing coolant and one on bottom to return it. 

[Tburercomanche]

And the return goes back into the radiator? If so where at?

[Jargon]

And the return goes back into the radiator? If so where at?

 

I'd have to look to double-check,not sure if it differs between open and closed systems. Either to the bottom of the radiator itself or it feeds into one of the larger tubes feeding back into the radiator.

[DirtyComanche]

Open systems only should have one hose, which is a small diameter hose off the boss for the rad cap. It goes to the bottom of the overflow bottle, or to a boss in it that has a drawstraw to the bottom of it. The bottle does not pressurize, excess coolant is dumped into the bottle as pressure builds with heat. On cooling the contraction produces a vacuum and pulls the previously excess coolant back out of the overflow bottle. The overflow bottle might also have an actual overflow hose on it, for in the event there is too much coolant put on the bottle in the cold state, and it will be routed overboard.

 

Hope that makes sense.

[Tburercomanche]

That's perfect thank you. I have another question. The hoses from the thermostat housing I think are ran wrong. On mine the water pump goes to the bottom hook up on the heater core. And the other small hose on top the housing goes to the top hookup on the heater core. If seen it both ways on here for some reason. What is the right way?

[Rockfrog]

When I made my impromptu catch bottle I just used a length of brake line to reach the bottom of the "bottle" then the rad line went to that. As DirtyComanche stated, the system overflows into the catch bottle from the bottom due to fluid expansion.

 

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[Rockfrog]

That's perfect thank you. I have another question. The hoses from the thermostat housing I think are ran wrong. On mine the water pump goes to the bottom hook up on the heater core. And the other small hose on top the housing goes to the top hookup on the heater core. If seen it both ways on here for some reason. What is the right way?

The core is just a simple pass through, it can be plumbed either way once the heater valve is ditched.

Open systems only should have one hose, which is a small diameter hose off the boss for the rad cap. It goes to the bottom of the overflow bottle, or to a boss in it that has a drawstraw to the bottom of it. The bottle does not pressurize, excess coolant is dumped into the bottle as pressure builds with heat. On cooling the contraction produces a vacuum and pulls the previously excess coolant back out of the overflow bottle. The overflow bottle might also have an actual overflow hose on it, for in the event there is too much coolant put on the bottle in the cold state, and it will be routed overboard.

 

Hope that makes sense.

 

Sent from my SGH-I337M using Tapatalk

[DirtyComanche]

 

That's perfect thank you. I have another question. The hoses from the thermostat housing I think are ran wrong. On mine the water pump goes to the bottom hook up on the heater core. And the other small hose on top the housing goes to the top hookup on the heater core. If seen it both ways on here for some reason. What is the right way?

The core is just a simple pass through, it can be plumbed either way once the heater valve is ditched

 

 

That. ^^^

 

Hornbrod will probably chime in with which way it's hooked up on the later model versions without the valve.  It would be the 'more correct' way to do it, but it won't affect function either way.  There is premolded hoses made for later XJs that fit perfectly if you want to spend a few bucks, otherwise bulk heater hose (which I'm guessing you have) works perfectly fine.  The premolded hoses do give a very clean look, and I will probably start buying them from now on.