Heat not Hot? Use CLR, and flush the Heater Core - Jeep Cherokee Forum
Jeep Cherokee Forum

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech
Log In 
Search


Heat not Hot? Use CLR, and flush the Heater Core

Reply
 
 
 
 
Thread Tools Search this Thread
Old 12-09-2010, 04:03 PM   #1
Junior Member
 
Join Date: Aug 2010
Location: Baltimore
Posts: 32

View BmoreCherokee's Photo Album My Photos
1999 Cherokee
Default Heat not Hot? Use CLR, and flush the Heater Core

I have a 98 and a 99 cherokee both with the 4.0. Past 2 weeks have been bitter, with windchills in the 20's. The heat in both have been lukewarm at best.

Did some searching here, as well as you tube. I had done a flush as well as t-stat change on both - but it was still not warm enough.

There is a great video on You Tube by Eric the Car Guy - and he does a backflush of the heater core. Using an air compressor, and then CLR, then water - wait till you see the gunk that comes out.

Basically take the heater core hoses off and the inlet (off the t-stat housing) becomes the outlet. the other hose will become the inlet.

You place the outlet into a 1 gallon milk jug. And using an air chuck (wrap some electrical tape around it so it fits snug), insert the air chuck into the inlet hose (normally the outlet hose). This is what you will connect the air compressor to. I used 30 psi.

Blow out what's in it - more than likely brown sludge. MAKE SURE TO WEAR EYE PROTECTION. TO MUCH AIR AT ONCE WILL SPRAY IT EVERYWHERE. Also - wear latex gloves. (if you search for the video - it will show you step by step).

Next, I took CLR, and mixed with water (50/50 mix). I then poured it into the inlet hose (normally the outlet hose - of course you need to remove the air chuck to do this). You will be doing a little bit at a time - probably about 12 - 16 oz at a time. Let it sit - then replace the air chuck - blow out the solution. Repeat this till it is gone. Then flush with water several times.

It took a couple of hours - but now the heat is HOT! cost $6.99 for CLR at Walgreens, etc.
BmoreCherokee is offline   Reply With Quote
Join Cherokee Forum

Join CherokeeForum.com Today - It's Totally Free!

Do you love your Jeep? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Jeep Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your jeep, and have a great time with other Jeep Cherokee fans.. Whether your an old timer or just bought your Jeep you'll find that CherokeeForum.com is a great community to join. Best of all it's totally free!

Join CherokeeForum.com Today! - Click Here JOIN FOR FREE


-->
Old 12-09-2010, 05:31 PM   #2
Senior Member
 
Join Date: Jun 2010
Posts: 702

View pickles's Photo Album My Photos
1993 Cherokee
Default

good to know, i'll have to try this out
pickles is offline   Reply With Quote
Old 12-09-2010, 08:33 PM   #3
Seasoned Member
 
98jeepcher's Avatar
 
Join Date: Dec 2009
Location: LaGrange, Ky
Posts: 380

View 98jeepcher's Photo Album My Photos
1998 Cherokee
Default

Worked like a charm for me!
98jeepcher is offline   Reply With Quote
Old 12-09-2010, 08:44 PM   #4
Junior Member
 
dirtyXJgirl's Avatar
 
Join Date: Dec 2010
Location: Greensboro,NC
Posts: 38

View dirtyXJgirl's Photo Album My Photos
1997 Cherokee
Default

THANK YOU!!!

i am doing this tomorrow.
__________________
'97 JEEP CHEROKEE
&& please keep your dick beaters off my jeep
dirtyXJgirl is offline   Reply With Quote
Old 12-10-2010, 04:02 AM   #5
Member
 
SweetLou's Avatar
 
Join Date: Sep 2009
Posts: 115

View SweetLou's Photo Album My Photos
1998 Cherokee
Default

Awsome, I may have to try this
__________________
Black XJ Club Member

SweetLou is offline   Reply With Quote
Old 12-10-2010, 06:34 AM   #6
CF Veteran
 
Join Date: Nov 2010
Location: In the middle of Minnesota!
Posts: 4,901

View tjwalker's Photo Album My Photos
1999 Cherokee
Default

I have used this technique successfully. It is worth a try before tearing the Jeep half apart to put that new heater core in.....................
__________________
Without data, all you have is an OPINION!

Past Jeeps: '49 ******, '81 Scrambler, '88 Comanche

Current Jeep: 1999 XJ Sport, bone stock, daily driver.

I work on Jeeps!!
tjwalker is offline   Reply With Quote
Old 12-10-2010, 02:24 PM   #7
Junior Member
 
Join Date: Aug 2010
Location: Baltimore
Posts: 32

View BmoreCherokee's Photo Album My Photos
1999 Cherokee
Default you will just be amazed by the gunk

with the 50/50 clr mix, I flushed 4 times (56 oz altogether) then flushed with water 4 times (another 56 oz) I have a bucket of brown sludge. when you flush into the milk jug (acutally use a Chik Fil A ice tea gallon jug since they are crystal clear) you will see all the sediment settle at the bottom.
BmoreCherokee is offline   Reply With Quote
Old 12-17-2010, 08:34 PM   #8
Newbie
 
Join Date: Dec 2010
Location: Shiloh, IL
Posts: 1

View sfforth4's Photo Album My Photos
Cherokee
Default

It fixed mine!!! Thankyou!!!
sfforth4 is offline   Reply With Quote
Old 12-17-2010, 09:56 PM   #9
Junior Member
 
Join Date: Dec 2010
Posts: 43

View 99PurpleHaze's Photo Album My Photos
1999 Cherokee
Default

Trying this tomorrow! (fingers crossed)
99PurpleHaze is offline   Reply With Quote
Old 12-17-2010, 10:03 PM   #10
Seasoned Member
 
lurk520's Avatar
 
Join Date: Apr 2010
Location: Tucson, AZ
Posts: 487

View lurk520's Photo Album My Photos
2002 Grand Cherokee
Default

I once had a heater core flush and yes it did resolve the issue....but the next winter the heater core began to leak, so I had to bypass it. Eventually I paid 350$ for a shop to replace it, could be even more expensive for an XJ??? I just got the feeling that if it's clogged, then it's not far from leaking... not sure though.... I did have some overheating issues with the vehicle that I guess could have possibly cracked the core, since it didn't have a valve system it was just hoses directly into the core....
__________________
93 XJ Sold! Darn!
lurk520 is offline   Reply With Quote
Old 12-17-2010, 11:41 PM   #11
Junior Member
 
Join Date: Nov 2010
Location: middle tn
Posts: 86

View xr650jkallen's Photo Album My Photos
2000 Cherokee
Default

yeah it worked wonders for me also did it today and WOW
xr650jkallen is offline   Reply With Quote
 
 
 
Reply


Tags
clogged, heat not hot, heater core, lukewarm heat, no heat
Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Refbacks are Off



All times are GMT -5. The time now is 06:30 PM.


This site is in no way affiliated with Jeep or Chrysler.

Emails Backup