Steps to Flush Heater Core - JeepForum.com
 
LinkBack Thread Tools
post #1 of 13 Old 08-24-2011, 08:20 AM Thread Starter
djflyy
Registered User
 
djflyy's Avatar
1999 TJ Wrangler 
 
Join Date: Mar 2008
Location: Boston
Posts: 3,654
Steps to Flush Heater Core

10/14/2011 Edit:

If you find yourself here looking for steps on flushing a heater core, please follow this link to my step by step write up (with photos) of the process.

-------------
Hey all,

So my TJ hasn't been blowing the same temp air in the winter that it used to, and so before things start freezing up and making this "mod" one that I can't do (no garage here) I was hoping to flush the heater core out and try and see if there's any gunk in the hoses that are preventing the real heat from coming through. I've read the threads on it, but unfortunately I must admit that I'm not entirely sure what hoses I need to disco and flush.

I was hoping someone might have photos of this that they could share so that I know exactly which hoses I'm going for. Best I've been able to find is from Stu's site, the following picture.. Should I just disconnect those two from both ends and run the garden hose through it?

Thanks, all!




'17 WK2 Trailhawk Expedition Build

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

e-mail me -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
djflyy is offline  
Sponsored Links
Advertisement
 
post #2 of 13 Old 08-24-2011, 08:30 AM
angelo2975
Registered User
 
angelo2975's Avatar
2002 TJ Wrangler 
 
Join Date: May 2010
Location: Tamarac
Posts: 243
Just a bit of FYI on the flushing part

http://www.cherokeeforum.com/f2/flus...er-core-14859/
angelo2975 is offline  
post #3 of 13 Old 08-24-2011, 08:47 AM
jeepinhokie
Registered User
 
jeepinhokie's Avatar
2004 TJ Wrangler 
 
Join Date: Apr 2010
Location: MD
Posts: 2,835
not my picture, but i circled the heater core hoses coming off of the water pump. this is where i have disconnected the hoses to flush the heater core. it gives you some hose to play with, so your not dumping antifreeze all over your firewall.

using a hose is fine, but you will want to collect the first few gallons out of the heater core b/c you are really flushing antifreeze out of the heater core. I placed a bucket in the engine bay to collect the anitfreeze. This will also allow you to tell if any debris is coming out of the heater core.

Do NOT use the hose on full blast, use a gentle flow of water and gradually increase the pressure.

if you do get a bunch of debris out of the heater core, it might be a sign that your water pump is starting to fail. at least my wifes cherokee was that way.

Please dispose of your used antifreeze properly. into the ground is not an appropriate disposal location.
Attached Thumbnails
4.0 L engine.jpg  

HOKIES UNITED!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jeepinhokie is offline  
 
post #4 of 13 Old 08-24-2011, 08:51 AM
JWebber
Registered User
1999 TJ Wrangler 
 
Join Date: Aug 2011
Location: Lewisville
Posts: 1,397
Th prestone flush kit is a easy thing to hook up and use. Just tap into the hot side heater core hose and turn on the water hose. But if you really want to remove crap spray a nozzle thru the return line etc.. I then blow air thru it to remove as much tap water as possible.
JWebber is offline  
post #5 of 13 Old 10-14-2011, 09:49 PM
BamaJeepman21
Registered User
 
BamaJeepman21's Avatar
1998 TJ Wrangler 
 
Join Date: Feb 2011
Location: Tuscaloosa
Posts: 4,204
Old thread I know but I don't want to start a new one. My heater blows hot some days and cooler others. I had the cooling system flushed back in July and apparently that should have flushed the core to. I want to flush the heater core myself but I'm reading that you have to refill with coolant? Some say it's just unplug, flush, plug while others are saying unplug, flush, dry, plug, refill. Also it doesn't matter if you unplug from the firewall or the one close to the radiator?

-Jack
BamaJeepman21 is offline  
post #6 of 13 Old 10-14-2011, 09:53 PM Thread Starter
djflyy
Registered User
 
djflyy's Avatar
1999 TJ Wrangler 
 
Join Date: Mar 2008
Location: Boston
Posts: 3,654
Quote:
Originally Posted by BamaJeepman21 View Post
Old thread I know but I don't want to start a new one. My heater blows hot some days and cooler others. I had the cooling system flushed back in July and apparently that should have flushed the core to. I want to flush the heater core myself but I'm reading that you have to refill with coolant? Some say it's just unplug, flush, plug while others are saying unplug, flush, dry, plug, refill. Also it doesn't matter if you unplug from the firewall or the one close to the radiator?

Here's a write up I did (with photos) on flushing a heater core. Wrote it a few weeks after posting this thread!

https://www.jeepforum.com/forum/f9/he...hotos-1266369/

'17 WK2 Trailhawk Expedition Build

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

e-mail me -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
djflyy is offline  
post #7 of 13 Old 10-14-2011, 09:59 PM
BamaJeepman21
Registered User
 
BamaJeepman21's Avatar
1998 TJ Wrangler 
 
Join Date: Feb 2011
Location: Tuscaloosa
Posts: 4,204
Quote:
Originally Posted by djflyy View Post
Here's a write up I did (with photos) on flushing a heater core. Wrote it a few weeks after posting this thread!

https://www.jeepforum.com/forum/f9/he...hotos-1266369/
Thank you my good man!

-Jack
BamaJeepman21 is offline  
post #8 of 13 Old 12-13-2013, 06:47 AM
tjlemay
Registered User
1998 TJ Wrangler 
 
Join Date: Dec 2013
Location: Harrisville
Posts: 16
Quote:
Originally Posted by djflyy View Post
Here's a write up I did (with photos) on flushing a heater core. Wrote it a few weeks after posting this thread!

https://www.jeepforum.com/forum/f9/he...hotos-1266369/
This was very helpful thank you.

Oh and I noticed that you have 35'' tires on you 99 tj lifted. Do they work well or do you find that you are rubbing to often? I have a 3'' suspension lift and I have 33'' tires, which have been pretty hard to find, so I just curious.
tjlemay is offline  
post #9 of 13 Old 11-07-2014, 04:47 PM
backyardjeeper
Registered User
1992 XJ Cherokee 
 
Join Date: Aug 2012
Location: raytown
Posts: 282
I did this last week. Worked great for a few days, then Back to no heat. Oddly enough, when it is just warming up (say around 150-170), I have lukewarm heat. When it warms all the way up to 200-210, it stops blowing warm and is just cold. I'm gonna try a complete flush, I'm afraid I had crud in other parts and it got pushed back into the nice clean core.

92 xj on 235/75/15's. $2000 into a $400 dollar jeep.
backyardjeeper is offline  
post #10 of 13 Old 11-24-2014, 02:59 PM
turpehar
Registered User
 
turpehar's Avatar
1977 CJ5 
 
Join Date: Apr 2007
Location: Central, IL
Posts: 1,242
Garage
I used a mixture of white vinegar and lemon juice after flushing it with clean water. The results were unbelievable. Filled up the core with 50/50 of vinegar and lemon juice, waited 30 minutes and flushed until clear. Repeat until only clear comes out after the 50/50 mix. My heater core seemed restored to normal operations.

I've been married so long I don't bother looking
both ways before crossing the road.


(Trial + error)*Upgrades) - $ = (mac-n-cheese/hot dogs)+experience


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
turpehar is offline  
post #11 of 13 Old 11-05-2017, 02:29 PM
Cincy71
Registered User
 
Join Date: Nov 2017
Posts: 6
Since this board has been so helpful to me, I thought I would share how I finally got heat out of my 2004 Wrangler. First let me tell you what I tried. I tried flushing with a water hose through the heater hoses about a dozen times. Water coming out of the hoses was clear as could be. Did the Prestone flush kit. I let CLR soak overnight. Flushed the whole system again and added new coolant/antifreeze. The heat was still barely blowing warm. I was a day away from taking out the dash and replacing the heater core.

So I decided to try circulating CLR using a pump. I bought a 300-500 gph submersible fountain pump from lowes. Took a milk jug, cut the top off, poured the CLR in and filled the rest with water. Hooked one of the heater hoses to the pump, submerged the pump in the mixture and let the other heater hose discharged in the same jug. Circulated for about 5 hours. Then hooked up a water hose to the heater hose and flushed again. About 30 seconds into the water flushing, something broke lose in the heater core and it just poured junk out. Hooked everything back up, topped off coolant and started the Jeep back up. Heat is blasting again.
Cincy71 is offline  
post #12 of 13 Old 11-05-2017, 02:42 PM
Cincy71
Registered User
 
Join Date: Nov 2017
Posts: 6
Adding picture. Hard to see but took a picture when the pump was circulating.
Attached Thumbnails
IMG_1190.jpg  
Cincy71 is offline  
post #13 of 13 Old 11-05-2017, 05:03 PM
Shark_13
Registered User
1998 TJ Wrangler 
 
Join Date: Dec 2012
Location: Post falls
Posts: 2,154
Garage
That's a cool idea!
Another member had mentioned they take a rubber mallet and lightly hit the firewall during the flushing process to help loosen the built up chunks inside.
I haven't tried it myself but I plan to next time.
Shark_13 is offline  
Reply

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











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
Heater Core Flush RowJ TJ Wrangler Technical Forum 5 02-07-2011 11:54 AM
heater core flush help mgaither0 TJ Wrangler Technical Forum 3 01-12-2010 07:18 PM
Correct way to flush your heater core! Bubba3200 TJ Wrangler Technical Forum 1 01-08-2010 11:28 AM
Flush The Heater Core???? gtospeeding TJ Wrangler Technical Forum 3 05-28-2008 11:51 AM
Heater Core Flush Question Jeebs YJ Wrangler Technical Forum 8 02-16-2008 06:34 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