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05-17-2009, 07:02 PM
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#1
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Seasoned
Join Date: Apr 2009
Posts: 60
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No Coolant Flow!?
i am working on the cooling system in my jeep and have found out there is no coolant flowing through the lines! i replaced the high pressure coolant bottle, lines from heater core to block (sending and return) thermostat, and water pump, i also did a complete coolant flush, and it seemed to be working when i did that before i even replaced anything, im baffled, why is nothing flowing! it just overheats! any advice?
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89 xj 2 door, lifted 4.5" on 33s
99 exploder on 31s
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05-17-2009, 08:52 PM
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#2
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Experienced
Join Date: May 2009
Location: Bellingham, WA
Posts: 154
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You did make sure you got the reverse rotation pump didn't you??
The XJ 4.0L pulley rides in the backside of the serpentine belt, so the pump on the XJ's runs backwards in comparison to the standard V-belt 4.0L's in some of the Wranglers....
If you got the wrong pump, it won't flow.....
What store did you get the pump from?
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Nose to tail:
'87 XJ D30/4.0L/AW4/NP231/D44
Last edited by poorboy_616; 05-17-2009 at 08:54 PM.
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05-17-2009, 09:03 PM
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#3
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Seasoned
Join Date: Apr 2009
Posts: 60
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i got it from napa auto parts. i told them exactly what year make model engine and everything. gave them the size of the hub and they gave me the one i installed.looked exactly like the one i pulled out of the jeep. could this be wrong?
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89 xj 2 door, lifted 4.5" on 33s
99 exploder on 31s
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05-17-2009, 11:17 PM
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#4
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The Guru of Nothing
Join Date: Sep 2008
Posts: 6,179
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Could be, you need to check to make sure you got the right direction. Also you may have gotten a bad pump or there could be an installation error.
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05-17-2009, 11:25 PM
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#5
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Senior Member
Join Date: Nov 2008
Posts: 551
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Try replacing the thermostat again, could be defective. Might be stuck closed and not alllowing it to open.
As it warms see if the upper hose gets warm, that'll tell you if you have no flow to the rad.
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05-18-2009, 08:28 PM
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#6
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Seasoned
Join Date: Apr 2009
Posts: 60
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i think its a blockage in the heater core
__________________
89 xj 2 door, lifted 4.5" on 33s
99 exploder on 31s
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05-18-2009, 09:17 PM
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#7
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Senior Member
Join Date: Nov 2008
Posts: 551
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Bypass it to test your theory.
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05-18-2009, 09:21 PM
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#8
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Seasoned
Join Date: Apr 2009
Posts: 60
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if it is that, what happens if i bypass it permanently, just a comfort thing? or will it mess with my cooling system?
__________________
89 xj 2 door, lifted 4.5" on 33s
99 exploder on 31s
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05-18-2009, 10:05 PM
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#9
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Senior Member
Join Date: Feb 2009
Posts: 953
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The heater core is for the heater, so if you bypass it, you just won't have heat!
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Just Empty Every Pocket
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05-29-2009, 01:52 AM
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#10
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Newbie
Join Date: Apr 2009
Location: salem, Oregon
Posts: 15
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I found the same issue with my 88 that I got for free (yay). It was overheating bad so I replaced tstat, yada yada. what I found, and others oten disagree, is that you MUST burp the system. the best way is to take the top radiator hose off from the tstat housing and fill radiator through that hose then fill block through tstat housing. then fill pressure bottle and continue as usual. This worked wonders on my toy. A lot of guys keep saying " you dont have to burp it" but as soon as I did I could see the water flowing back into the pressure bottle when I couldnt before.
Take it or leave it, just some advice.
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05-30-2009, 06:29 PM
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#11
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Experienced
Join Date: May 2009
Location: Bellingham, WA
Posts: 154
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I had to burp mine when I flushed last year (its due again). Without the burp, their is an air bubble trapped under the t-stat. With the air bubble in place, the t-stat won't open, so it overheats....
__________________
Nose to tail:
'87 XJ D30/4.0L/AW4/NP231/D44
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05-31-2009, 01:13 AM
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#12
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Seasoned
Join Date: Apr 2009
Posts: 60
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will do that when i figure out the vacuum mystery hah
__________________
89 xj 2 door, lifted 4.5" on 33s
99 exploder on 31s
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08-27-2010, 04:15 PM
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#13
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Seasoned
Join Date: Jul 2010
Posts: 32
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"I had to burp mine when I flushed last year (its due again)."
How do you guys flush the system????? I have the Prestone Flush N Fill Kit" plastic "T" installed in the correct hose and from there lost because I do not have a "radiator cap".
The directions call for attaching garden hose to the plastic "T" and then opening up the radiator cap and put on the "splash tube" (for the exiting water).
So...suggestions??????
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08-27-2010, 05:40 PM
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#14
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Senior Member
Join Date: Sep 2008
Location: Columbus, OH
Posts: 936
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You have a closed coolant system. Same concept...just remove the cap on the coolant bottle.
__________________
-Chrysler Certified Technician
Empire Offroad
"Remember mad cow disease? Well mad cow became mad person, which became mad zombie." -Columbus, Ohio Zombieland
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