Neglected Cooling System - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 07-22-2013, 07:19 AM   #1
bmmiller's Avatar
Join Date: Oct 2012
Location: Germantown, TN
Posts: 162
Neglected Cooling System

I'm doing my best to get my coolant system flushed clean. I'm a perfectionist so I want the water I flush through it to come out clean enough to drink. Well at least look clear. I also just put in a new water pump, thermostat, thermostat housing, and radiator, and I'm wanting these parts to last a while. Right now when I run water through it, it still comes throw extremely dirty and yes I have flushed, back flushed, and run a flush cleaner through it twice. It still comes out brown. I thought it was mixing with oil but I can't get it to separate from the water so it seems to be real dirty. Any ideas out there of what to do. Should I continue to run flush through it or just continue to put in water, run it, drain, and repeat?

bmmiller is offline   Quote Quick Reply
Old 07-22-2013, 07:27 AM   #2
Mowrangler's Avatar
Join Date: Jun 2013
Location: Tampa Fl.
Posts: 1,228
The rust you see is actually turned to mud at the bottom of the cooling jackets the only way to get rid of it is to remove and dissasemble the engine and have the bare blocked tanked at a machine shop.Any flush that would break up that sediment will RUIN all those new parts you just put in. Allyou can do is rinse and repeat or ignore it.

Mowrangler is offline   Quote Quick Reply
Old 07-22-2013, 07:44 AM   #3
bmmiller's Avatar
Join Date: Oct 2012
Location: Germantown, TN
Posts: 162
Thanks. That's kinda what I figured it would be. I was hoping just maybe someone out there knew a trick I didn't. I appreciate the info. Always helps when I hear it from another jeep owner. I think I'm going to continue to flush with water and fingers crossed that helps a little.
bmmiller is offline   Quote Quick Reply
Old 07-22-2013, 08:04 AM   #4
Megamonster's Avatar
Join Date: Apr 2013
Location: Southern Europe
Posts: 135
Try using evapo-rust.
91 YJ 2.5 Manual
Megamonster is offline   Quote Quick Reply
Old 07-22-2013, 08:08 AM   #5
1987Wrangler YJ's Avatar
Join Date: Jun 2013
Posts: 568
mine took about 45 mins before the water was clear. then I put the new parts on. I hope you didn't put the new parts on then flush it because the will destroy the seal in your water pump.
1987Wrangler YJ is offline   Quote Quick Reply
Old 07-22-2013, 08:17 AM   #6
bmmiller's Avatar
Join Date: Oct 2012
Location: Germantown, TN
Posts: 162
I'll look into the evap rust. Thanks. And unfortunately the new parts were on and I did flush it. I didn't realize it was so bad. I flushed it out with a hose before I put on the new parts but after they were installed I ran it some and checked it and it looks bad so I drained it flushed it out with a hose again and then put a flush + cleaner in it for a few days and then chased it with distilled water. I have been running stilled water in it and draining it everyday for 5 days now.
bmmiller is offline   Quote Quick Reply
Old 07-22-2013, 08:56 AM   #7
Join Date: Jul 2013
Location: Greenville, South Carolina
Posts: 51
Just went through the same with my 92 YJ, W/P, thermostat, hoses. There were no original issues just thought it was time for some preventative maintenance. As yourself my expectations of getting the system clean fell short of reality. Had the radiator out flushed the system with water until it was clear. Was going to have the radiator boiled out and pressured tested but found very few shops do that work any more. So I preceded to flush the radiator until clear water came out. Next day did the same, Hmmm, rusty water again, next day flushed again with same results, this process went on for a few days with rusty water initially every day. Finally spoke with an old timer who used to rebuild radiators, his advise was, quit messing with it before I do need a new radiator, what I was seeing is perfectly normal and install it. Long story short, did install with hesitation, filled it up and to my surprise the coolant is clean and green. I know what your feeling, anything short of perfect is disappointing, but sometimes it is what it is, otherwise you will end up losing sleep, your "Jeep Joy" and in debt. My thoughts are, do the best you can (now be reasonable), be proud of your work and most importantly "ENJOY", not everything will be perfect, that is what it is all about.

Dano222 is offline   Quote Quick Reply

Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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.

Thread Tools

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 Off
Refbacks are Off

» Featured Product

All times are GMT -5. The time now is 03:53 PM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC