Coolant Constantly Overflowing - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 19 Old 06-27-2012, 04:35 PM Thread Starter
aldersonfilm
Registered User
1998 TJ Wrangler 
 
Join Date: Jun 2012
Location: Pasadena
Posts: 277
Coolant Constantly Overflowing

So I got myself a 1990 XJ recently and have since replaced the expansion tank with a new one and replaced the thermostat as the previous owner took it out for some unknown reason.

Now, however, every time I shutoff the engine after driving, within a few seconds the cap on the expansion tank pops up and hot coolant comes gushing out. The cap is already really finicky, despite it being brand new and does not feel very secure when tightened. Not sure what the deal is but I have had to put new coolant in the jeep about 5 times now. Any good ideas?

aldersonfilm is offline  
Sponsored Links
Advertisement
 
post #2 of 19 Old 06-27-2012, 04:41 PM
AZ Jeff
Web Wheeler
2014 JK Wrangler 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona
Posts: 7,698
Replace the tank AND the cap with a new one.

Or better yet, convert to an "open" cooling system.

AZ-Jeff
I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
So...I stick around and give advice.
AZ Jeff is offline  
post #3 of 19 Old 06-27-2012, 05:00 PM
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott
Posts: 11,106
You could try this. Replace the cap with one from Napa. Part number 703-1396.
cruiser54 is offline  
post #4 of 19 Old 06-27-2012, 07:01 PM
djb383
Registered User
1998 XJ Cherokee 
 
Join Date: Jan 2010
Location: The Republic of TEXAS
Posts: 2,200
Quote:
Originally Posted by aldersonfilm View Post
........ and replaced the thermostat as the previous owner took it out for some unknown reason.........
The main reason people remove a t-stat is they think it will solve a overheating issue. If removing the stat doesn't correct an overheat, then the problem lies elsewhere. If a new bottle/cap r pukeing, it may be actually over heating. Have u verified temp?
djb383 is offline  
post #5 of 19 Old 06-28-2012, 01:22 PM Thread Starter
aldersonfilm
Registered User
1998 TJ Wrangler 
 
Join Date: Jun 2012
Location: Pasadena
Posts: 277
I've been going off the gauge on the dash which appears to be functioning normally. It hasn't passed 210 at all. The strange part is that it ONLY happens a couple seconds after shutting off the engine. I can hear pressure building and then the cap pops off and pukes coolant. It might be possible that I'm overfilling it, though I always fill it up to just above the notch in the post inside the coolant tank. Is it normal for the cap on the expansion tank to be so finicky?? I have to screw it down and then press down for a short turn. If I turn it at all too far it just pops back up and even when it feels like it's on there, if you wiggle it even a little, it'll come loose. But the old tank and cap did the same thing...
aldersonfilm is offline  
post #6 of 19 Old 06-28-2012, 03:47 PM
djb383
Registered User
1998 XJ Cherokee 
 
Join Date: Jan 2010
Location: The Republic of TEXAS
Posts: 2,200
Sounds like the cap and bottle r still faulty.....it's got to hold pressure, otherwise, the coolant will boil at about 212. If coolant boils, it will no longer absorb heat. It's the pressure, for the most part, that keeps coolant from boiling.
djb383 is offline  
post #7 of 19 Old 06-28-2012, 04:03 PM
Motorcharge
Bandeded
 
Motorcharge's Avatar
 
Join Date: Oct 2008
Posts: 13,666
Are you burping the air out of the system after you add coolant?

http://www.lunghd.com/Tech_Articles/...BurpAirMod.htm


Quote:
Originally Posted by Ron Swanson
There is no such thing as bad weather. Only inadequate clothing and transportation.
Motorcharge is offline  
post #8 of 19 Old 06-28-2012, 04:22 PM
overlandchris
Registered User
2004 WJ 
 
Join Date: May 2009
Location: Quincy MA
Posts: 329
Have you tried checking to see I'd the hole in the side if the rad filler that goes to the expansion tank is blocked or if the hose is blocked? I have had this happen to me a and it caused coolant to pop the cap in my wj not to as extreme as your situation but similar.

4.7 V8 H.O. The Chevy 302 of Jeep Engines. Roar...

2004 Grand Cherokee Overland, Midnight Blue Pearl.
Rusty's 2" Budget boost, It Goes fast
Project "Shamrock": 96 Cherokee country, black, I6 HO, ZJ 242, 4.5 Rustys, 33" Mud terrains
My build: http://www.jeepforum.com/forum/f22/9...build-1250478/
overlandchris is offline  
post #9 of 19 Old 06-28-2012, 05:53 PM
keepishop
Registered User
1989 XJ Cherokee 
 
Join Date: Oct 2008
Location: Seattle
Posts: 3,372
Quote:
Originally Posted by overlandchris View Post
Have you tried checking to see I'd the hole in the side if the rad filler that goes to the expansion tank is blocked or if the hose is blocked? I have had this happen to me a and it caused coolant to pop the cap in my wj not to as extreme as your situation but similar.
Totally different parts and mechanisms are in use pre 91.

OP, either switch to a higher quality bottle or convert to an open system. I redid mine as an open system and it's been pain-free for a year now.


Current: Black 89 limited, dakota bastard pack, zj coils, 1.5" lift, open cooling swap, bronco 2 carrier, rad fan switch
Rest in Pieces: Red 1990 cherokee dana30/8.25 - v8 zj coils & s10 bastard pack 2.5" lift - 31x10.5r15 tires - v8 zj tierod

Quote:
Originally Posted by talentjeep View Post
Bleed or Quit.
jf irc @ irc.freenode.net #jeepforum
keepishop is offline  
post #10 of 19 Old 06-28-2012, 06:57 PM
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott
Posts: 11,106
Or simply go to Napa and get a 703-1396 cap for your bottle.
cruiser54 is offline  
post #11 of 19 Old 06-28-2012, 07:12 PM
austin6137
Registered User
1990 XJ Cherokee 
 
Join Date: Sep 2008
Location: PA
Posts: 1,093
I have this exact problem, if I fill the bottle to the mark. When i drive the jeep it never overheats, but the moment i park it it pukes out whats in the tank. Now if i leave it low and don't refill the tank its fine, there's still coolant in the system. With it low it mine doesn't overheat, puke coolant its been absolutely fine for two years. I'm not saying you should do it but it's been working fine for me, I never usually let fluids low but it works. I've tried burping it there's no air in it.

90 - xj laredo- 4.5" rough country lift, 6.5" of total lift with drop brackets, zj disc brakes on c8.25, olympic winch bumper, jcr upper and lower quarter armor, IRO hack-n-tap and rock sliders and rear bumper. rugged ridge 8500lb winch. Spartan locker up front. With a jd yellow paint job, 97+ front end and bushwacker cut out flares. 35's
austin6137 is offline  
post #12 of 19 Old 06-28-2012, 07:35 PM
Motorcharge
Bandeded
 
Motorcharge's Avatar
 
Join Date: Oct 2008
Posts: 13,666
Quote:
Originally Posted by austin6137 View Post
I have this exact problem, if I fill the bottle to the mark. When i drive the jeep it never overheats, but the moment i park it it pukes out whats in the tank. Now if i leave it low and don't refill the tank its fine, there's still coolant in the system. With it low it mine doesn't overheat, puke coolant its been absolutely fine for two years. I'm not saying you should do it but it's been working fine for me, I never usually let fluids low but it works. I've tried burping it there's no air in it.
Same question to you as the OP, have you burped any air out of the cooling system? Link further up for how to.


Quote:
Originally Posted by Ron Swanson
There is no such thing as bad weather. Only inadequate clothing and transportation.
Motorcharge is offline  
post #13 of 19 Old 06-28-2012, 08:27 PM
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott
Posts: 11,106
Burp the air and use the Napa cap.
cruiser54 is offline  
post #14 of 19 Old 06-28-2012, 09:09 PM
Paradise XJ
Registered User
1988 MJ Comanche 
 
Join Date: Jan 2007
Location: Paradise, CA
Posts: 2,424
Quote:
Originally Posted by cruiser54 View Post
You could try this. Replace the cap with one from Napa. Part number 703-1396.


Quote:
Originally Posted by cruiser54 View Post
Or simply go to Napa and get a 703-1396 cap for your bottle.



Quote:
Originally Posted by cruiser54 View Post
Burp the air and use the Napa cap.



From what I can tell at least 33.3% of the respondants here agree.

The pressure bottles are crap (unless you have a metal one), the caps are even worse. Having a proper cap and bottle are crucial with a RENIX XJ.

Both my Jeeps are converted to open. It's not a cure all but it sure does cure the stupid bottle & cap. The new cap is certainly a good start, but I'll give it a year til it craps out again.

1990 XJ Laredo - White & Chrome
1988 MJ Pioneer - Metallic Green and Black
˘
Paradise XJ is offline  
post #15 of 19 Old 06-28-2012, 09:39 PM
austin6137
Registered User
1990 XJ Cherokee 
 
Join Date: Sep 2008
Location: PA
Posts: 1,093
Quote:
Originally Posted by Motorcharge View Post
Same question to you as the OP, have you burped any air out of the cooling system? Link further up for how to.
Yes as I stated its air free, I'll try the cap. At the moment im not to concerned it doesn't over heat even with the ac on so im not worried.

90 - xj laredo- 4.5" rough country lift, 6.5" of total lift with drop brackets, zj disc brakes on c8.25, olympic winch bumper, jcr upper and lower quarter armor, IRO hack-n-tap and rock sliders and rear bumper. rugged ridge 8500lb winch. Spartan locker up front. With a jd yellow paint job, 97+ front end and bushwacker cut out flares. 35's
austin6137 is offline  
Reply

Tags
coolant , overflow tank

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
coolant overflowing in the res... Gnl.Weirdness XJ Cherokee Technical Forum 13 04-06-2010 07:09 AM
Low Coolant light constantly flashes medicmandan XJ Cherokee Technical Forum 6 12-05-2009 02:33 PM
engine coolant overflowing m_w_m XJ Cherokee Technical Forum 6 08-04-2005 05:19 PM
overflowing expansion tank rokclimbertx XJ Cherokee Technical Forum 5 09-08-2004 08:35 PM
coolant overflowing........... jerryhipp XJ Cherokee Technical Forum 3 10-25-2002 10:01 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome