97 xj heat problem
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Joined: Aug 2011
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Senior Member
Joined: Jun 2014
Posts: 925
Likes: 6
From: Eagle River, Alaska
Year: 1999
Model: Cherokee (XJ)
Just tried to flush my heater core and I got zero water through the system. Removed both hoses and cleaned them thoroughly (they were very clogged). What should my next step be?
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
How did u try to flush the heater core?
Senior Member
Joined: Jun 2014
Posts: 925
Likes: 6
From: Eagle River, Alaska
Year: 1999
Model: Cherokee (XJ)
http://www.jeepforum.com/forum/f9/he...topics/1266369
Couldn't flush out whatever buildup is in there enough to get the water to flow from one hose out the other.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Senior Member
Joined: Jun 2014
Posts: 925
Likes: 6
From: Eagle River, Alaska
Year: 1999
Model: Cherokee (XJ)
Took the cap off my radiator after my failed heater core flushing attempt to make sure my coolant level is good, this is what I found..

The hose that goes from the fill neck to the overflow bottle is completely blocked with calcium or whatever this crap is. Figure this is causing my low operating temperatures and no heat problem.
How should I tackle this?

The hose that goes from the fill neck to the overflow bottle is completely blocked with calcium or whatever this crap is. Figure this is causing my low operating temperatures and no heat problem.
How should I tackle this?
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Remove the heater hose and the rad hose from the t-stat cover. Remove the bottom rad hose from the water pump. Stick a garden hose in the heater hose and flush, flush, flush. Stick the garden hose in the heater hose nipple on the stat cover and flush, flush, flush. Stick the garden hose in the top rad hose and flush, flush, flush.
That pic is really bad and many flushes may, may not work. A cooling system doesn't get like that overnight, lots of neglect there.
Read my sig.
That pic is really bad and many flushes may, may not work. A cooling system doesn't get like that overnight, lots of neglect there.
Read my sig.
Last edited by djb383; Feb 22, 2015 at 05:34 PM.



