Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum > 00 wrangler 4.0 coolant is very dirty black

Join Wrangler Forum Today

Thread: 00 wrangler 4.0 coolant is very dirty black Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

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:
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.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
04-30-2013 08:19 AM
sevenservices Is it an automatic? If so, the trans fluid runs through part of the radiator. Could be a crack in the radiator letting burnt trans fluid mix w/the coolent. If your oil is not looking like chocolate milk, and its an auto, it could also be this.

Could also be hoses wearing. If you pull a hose and wipe the inside with your finger and its all black... theres your culprit.
04-30-2013 08:04 AM
flflash Oil gets black with normal use as long as you dont see metal particals or it looks like a milkshake ( literaly when coolant mixes with oil it looks alot like a Wendy's Frostie ) Your coolant turning black is a concern though, I'd suggest getting a block tester and checking the system. Sounds like you have a cracked cylinder head or head gasket leaking combustion gases into the cooling system.
Here's a link the explains more: Head Gasket or Combustion Leak Test Procedure (Gasoline Engines Only)
04-30-2013 06:24 AM
homebrwd Head gasket is a probable cause.
04-30-2013 12:22 AM
c.busby94 Yes it is pretty oily.
04-28-2013 10:31 PM
mrpotatohead When water and oil mix it makes a nasty milky goo. Was your coolant oily or just dirty?
04-28-2013 10:21 PM
00 wrangler 4.0 coolant is very dirty black

I have a 2000 wrangler sport 4.0 with 94000 miles and i was changing the oil and it was very dirty, and then i checked the coolant and it was very dirty black, so we flushed it out with water then then put new coolant in and after it cycled through it was completely black again and we had it running and the radiator cap was off and we could see the coolant raising up to the top and going right back down (some one told me that could be a blown head gasket). what do you think??

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

All times are GMT -5. The time now is 03:31 AM.

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