cooling system overflow tank - JeepForum.com

 
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post #1 of 13 Old 04-10-2016, 01:24 PM Thread Starter
beets
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cooling system overflow tank

The tank in my 96 5.2l engine is cracked beyond repair, the replacement tank I was sent has no overflow outlet tube. Is this gong to cause problems, or will the overflow vent out the cap?

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post #2 of 13 Old 04-10-2016, 02:10 PM
Pierre_r
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Yes it will cause problems.
The coolant in the radiator cant go in to the tank and will dump on the ground instead when it heats up.
Eventually your cooling system will run out off coolant and you will have a overheating engine.

Send back the tank, its not the one you need if it dont have that connection for the hose between the radiator and the tank.

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post #3 of 13 Old 04-10-2016, 02:45 PM
Punisher_tx_83
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I got a '97 and replaced mine 2 days ago. The one I bought didn't have the overflow outlet as well. It had the nipple for it so I tried trimming it. No go, it's solid. I'm running it anyway until I figure something out. Then again it may vent from the cap...

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post #4 of 13 Old 04-10-2016, 04:24 PM
Uniblurb
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The way the cooling system works is as the coolant reaches higher temps it expands creating pressure and the rad cap opens. This hot coolant is pushed into the reserve tank through the hose on the rad neck.

Then after shut-down the coolant cools creating a vacuum in the engine/rad so the coolant is pulled back into these from the tank.

As Pierre already mentioned with no coolant reservoir connection the hot coolant is just going to dump on the ground. Not only will it not be recovered but not good to have poisonous antifreeze maybe puddling under your ZJ on shut-down.

Plus since the tank to rad neck has no connection there's a good chance as the coolant cools the vacuum is just going to pull air into your cooling system.

Send that tank back and get the correct one with a connection tube. OE for your 96 is 52028252 and if you don't buy Mopar buy an aftermarket one which cross-references with this OE number.
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post #5 of 13 Old 04-10-2016, 04:34 PM
Punisher_tx_83
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I was talking about the overflow on the reservoir tank itself. Not the connection between the reservoir tank and radiator.

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post #6 of 13 Old 04-10-2016, 06:41 PM
zjosh93
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It's fine. Coolant should never get to the cap level unless you really overfill it. The vent is just there to give the air somewhere to go as the tank level rises and falls.
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post #7 of 13 Old 04-10-2016, 07:07 PM
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Yeah, I misunderstood the first part of this thread and reply thinking there was no line connected at all from tank to rad neck. Agree with Josh that closed off rear vent is just for additional air space so those tanks shouldn't be a problem w/o it.
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post #8 of 13 Old 04-11-2016, 01:06 AM
Pierre_r
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Quote:
Originally Posted by Uniblurb View Post
Yeah, I misunderstood the first part of this thread and reply thinking there was no line connected at all from tank to rad neck. Agree with Josh that closed off rear vent is just for additional air space so those tanks shouldn't be a problem w/o it.
I also misunderstood it.

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post #9 of 13 Old 04-11-2016, 10:46 AM
jeepjeepster
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My 94 doesn't have an overflow tube yet my 98 5.9 does. Took me awhile to figure out what that tube was when I first looked in the passenger side fender well.

I assume the 94 just vents to the atmosphere through the cap.

1994 ZJ-I6 w/216,000 mi
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post #10 of 13 Old 04-11-2016, 11:39 AM
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Interesting jeepjeepster and they must have changed the coolant reservoir from 94 to 95. I entered in your 94 in the below ebay link to the 52028252 coolant reservoir with the back closed vent tube which says it fits the 95-96 but not the 94.

http://www.ebay.com/itm/New-Coolant-...dW~c4o&vxp=mtr

I had gone out and looked at my 96 4.0 in the middle of this thread before Josh had posted. Thought I had missed something and noticed I do have the back vent tube, or whatever it's called, which is closed off with nothing attached.

Who knows how thick the plastic is on that $20 ebay tank in the link? I've read before where they're going to be thinner or flimsier than OE.
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post #11 of 13 Old 04-11-2016, 11:50 AM
zjosh93
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I bought a new tank about a year ago. I've seen two different kinds in the junkyard as well. Some like mine are more square and use a threaded cap with a vent in the cap. The later ones have a yellow snap on (?) cap and are more rounded. It looked like the mounts were the same but I never directly compared them. I found an OEM reservoir on eBay or Amazon or RockAuto for around $40.
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post #12 of 13 Old 04-11-2016, 01:13 PM
jeepjeepster
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Yup. My 94 has a black screw on cap and my 98 has a yellow snap on cap.

The original black cap disintegrated on 94 so I bought a dorman cap to replace it. So far so good.

1994 ZJ-I6 w/216,000 mi
1998 ZJ 5.9 w/65,155 mi Slate Black
2004 KJ w/90,300 mi
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post #13 of 13 Old 04-11-2016, 01:35 PM
Uniblurb
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I can vouch for the 96 having the yellow snap-on cap. Especially since the demon squirrel here has chewed on it while pulling it clear off at least a dozen times! Grrr...

http://www.jeepforum.com/forum/f13/t...l#post32262122
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