Coolant Flush Question. OAT & HOAT Compatibility - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-24-2013, 03:50 PM   #1
Jeeper
 
rkulp89's Avatar
 
Join Date: Aug 2013
Posts: 57
Coolant Flush Question. OAT & HOAT Compatibility

I just bought my first Wrangler w/ 70k on it and am in the process of replacing all the fluids. The jeep is in excellent condition and appears to be maintained properly but I would feel better knowing all my fluids are fresh from the get go.

I was going to do a complete flush of the coolant system but when I drained the current antifreeze it appeared to be very clean and bright still. I decided I would just run it full of distilled water for 10mins (Heater on) and drain, I did this twice.

I then filled the system with 5.25 quarts of pure Peak Long Life and topped off with distilled water. After doing some online research about the differences between OAT & HOAT type coolants I can not seem to get a definite answer if they are OK to interchange. I believe what was in their was the HOAT but I am not sure, it was a pink color.

From what I understand, it is OK to use different coolants if you do a full flush. Because I didn't really do a full flush I am wondering if I should do a complete flush and start over.

I could still see a pinkish tint in the water the second time I drained my radiator so I'm sure there is still a small amount of the old coolant still in the pipes. What do you guys suggest I do?

rkulp89 is offline   Quote Quick Reply
Old 08-24-2013, 04:14 PM   #2
Jeeper
 
jksavage's Avatar
 
Join Date: Nov 2012
Location: Clearwater
Posts: 144
I have an 06 that I've done the same to that has 87k and was getting a little milky. I did allot if research prior as to not make a mistake with kind (I.e. pink, green, orange etc.) what I found is that GMs pink from the mid 90s Dex-cool was really the only one that was recommended not to mix. Now, and this comes from a reputable radiator shop says that current coolant is relatively mixable and major difference in the HOAT and OAT is serviceability life and higher temp rating. I used Zerex G-05 and so far after a couple of months all seems well. Hope this helps.

jksavage is offline   Quote Quick Reply
Old 08-24-2013, 05:24 PM   #3
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,823
Images: 2
The color of coolant cannot be relied upon to tell what type of coolant it is, the color is simply a dye & there is no consistency of colors within the different coolant classifications.

Before going to HOAT, I would do a thorough flush & do the last part of the flush with distilled water. You'll need to add more coolant than distilled water to come up with the desired 50:50 ratio due to how much plain water will be left in the block after the flush.

Make sure to only use distilled water for the final coolant mix.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 08-24-2013, 05:55 PM   #4
Jeeper
 
rkulp89's Avatar
 
Join Date: Aug 2013
Posts: 57
Quote:
Originally Posted by jksavage View Post
I have an 06 that I've done the same to that has 87k and was getting a little milky. I did allot if research prior as to not make a mistake with kind (I.e. pink, green, orange etc.) what I found is that GMs pink from the mid 90s Dex-cool was really the only one that was recommended not to mix. Now, and this comes from a reputable radiator shop says that current coolant is relatively mixable and major difference in the HOAT and OAT is serviceability life and higher temp rating. I used Zerex G-05 and so far after a couple of months all seems well. Hope this helps.
This makes me feel a bit better. I don't think I am really mixing too much of the other coolant in with the new but I know that Peak Long Life is an OAT coolant not a HOAT which is recommend.

Quote:
Originally Posted by Jerry Bransford View Post
The color of coolant cannot be relied upon to tell what type of coolant it is, the color is simply a dye & there is no consistency of colors within the different coolant classifications.

Before going to HOAT, I would do a thorough flush & do the last part of the flush with distilled water. You'll need to add more coolant than distilled water to come up with the desired 50:50 ratio due to how much plain water will be left in the block after the flush.

Make sure to only use distilled water for the final coolant mix.
My concern is that I am not going to the HOAT coolant, I am putting in OAT (Peak Long Life). Like you said, I can't tell what coolant was in the system just by the color but if it was serviced with the recommended (HOAT) coolant, then I am mixing a slight amount of the diluted coolant that was left in the block after 2 flush cycles of 100% distilled.
rkulp89 is offline   Quote Quick Reply
Old 08-24-2013, 06:48 PM   #5
Jeeper
 
freeskier's Avatar
 
Join Date: Mar 2011
Location: Longmont, CO
Posts: 2,536
I wouldn't run HOAT in a Jeep. Coolant type is specified because it is compatible with the metals and gasket materials used in the vehicle. The standard IAT "green stuff" coolant and OAT Zerex G0-5 are the only coolants specified for use in our systems.
__________________
CU Boulder Aerospace Engineering
freeskier is online now   Quote Quick Reply
Old 08-24-2013, 07:17 PM   #6
Jeeper
 
rkulp89's Avatar
 
Join Date: Aug 2013
Posts: 57
Quote:
Originally Posted by freeskier View Post
I wouldn't run HOAT in a Jeep. Coolant type is specified because it is compatible with the metals and gasket materials used in the vehicle. The standard IAT "green stuff" coolant and OAT Zerex G0-5 are the only coolants specified for use in our systems.
1.) Mopar HOAT is what the Wrangler manual calls for.

2.) Zerex G0-5 is a HOAT coolant not an OAT.

I don't anything you said is correct.
rkulp89 is offline   Quote Quick Reply
Old 08-24-2013, 08:28 PM   #7
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,823
Images: 2
X2, G-05 is a HOAT coolant & is a very good choice.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 08-24-2013, 08:35 PM   #8
Jeeper
 
pcwolf's Avatar
 
Join Date: Feb 2012
Location: Yorktown
Posts: 331
Only place I found that stocks Zerex G-05 here in Tidewater Virginia was O'Reilly Auto. Fairly reasonable price
__________________
-Phil

Man out standing in his field
o|||||||o
pcwolf is offline   Quote Quick Reply
Old 08-24-2013, 09:11 PM   #9
Jeeper
 
rkulp89's Avatar
 
Join Date: Aug 2013
Posts: 57
Should I flush the OAT Peak Long Life I just put in for some sort of HOAT coolant (Zerex, Mopar, etc.)? Please explain why or why not
rkulp89 is offline   Quote Quick Reply
Old 08-24-2013, 09:32 PM   #10
Jeeper
 
freeskier's Avatar
 
Join Date: Mar 2011
Location: Longmont, CO
Posts: 2,536
Whoops, sorry I got HOAT and OAT reversed.


Also IAT was specified for the early model TJs. It was early 2000s they switched from regular IAT to HOAT.

__________________
CU Boulder Aerospace Engineering
freeskier is online now   Quote Quick Reply
Reply

Quick Reply
Message:
Options

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.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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 12:02 PM.



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