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Unread 04-11-2015, 08:10 PM   #1
MetalHead0723
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Color Changing Engine Coolant?

So I recently noticed that my coolant reservoir was completely empty, but my radiator was full with green, so I topped off the reservoir with NAPA green 50/50 pre-diluted antifreeze/coolant.

It was green coming out of the jug, but after checking it again a couple days later, its changed to almost a very light red, like watered down transmission fluid.

Is this supposed to happen or do I have a bigger issue with my radiator system?

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Unread 04-11-2015, 08:15 PM   #2
Unlimited04
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did you know color is completely irrelevant?

you want to use the correct chemistry....otherwise you're playing a chemistry experiment with your cooling system. there are three main chemistries and they are not compatibility at all.

read these...
HOAT Coolant Summary
Brown in my radiator? Flush write-up
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Unread 04-11-2015, 08:53 PM   #3
chris142
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Did you mix a Long Life coolant with a conventional green? If so thats a contamination problem. All makes All models means long life coolants only not old skool greem with silicates.
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Unread 04-11-2015, 10:15 PM   #4
MetalHead0723
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I guess I will be flushing my radiator and reservoir. From what I hear its a pretty simple process, uncap the radiator and reservoir, loosen the drain cap on the bottom of the radiator, drain all the coolant, flush the rest out with a garden hose, then fill it back up with proper coolant?

Any suggestions as to what I should be using for coolant?
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Unread 04-11-2015, 10:37 PM   #5
Knuckelhead
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If you open the drain petcock without taking the radiator cap off, the coolant reservoir will be drained also...
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Unread 04-11-2015, 11:08 PM   #6
RDaniel2405
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Quote:
Originally Posted by MetalHead0723 View Post
Any suggestions as to what I should be using for coolant?
Mopar 68048953AB, and distilled water
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Unread 04-12-2015, 12:54 AM   #7
SkeeterTZX
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im wondering if you dont have a leak...either in your transmission cooler or a head gasket/head issue.
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Unread 04-12-2015, 09:01 AM   #8
MetalHead0723
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Originally Posted by SkeeterTZX View Post
im wondering if you dont have a leak...either in your transmission cooler or a head gasket/head issue.
Why do you think that?
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Unread 04-12-2015, 09:08 AM   #9
centerfireman
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Also, turn your heater to "high" (so that the coolant in the heater core gets flushed and drained also).
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Unread 04-12-2015, 09:15 AM   #10
Unlimited04
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Originally Posted by centerfireman View Post
Also, turn your heater to "high" (so that the coolant in the heater core gets flushed and drained also).
the heater setting on the TJ dash has nothing to do with fluid flow through the heater core itself.
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Unread 04-12-2015, 10:28 AM   #11
GringoLoco
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I'm far from a fully knowledgeable mechanic but I believe you want to get the engine hot enough to open the thermostat when flushing. Is that still necessary with our engines? I did to be safe but wasn't 100% sure it was necessary. I switched to the newer coolant so I really needed a full flush.
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Unread 04-12-2015, 10:42 AM   #12
MetalHead0723
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Is my previous post about the process of flushing the system correct? That's what I heard is done on a JK, I'm not sure if its the same for a TJ.
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Unread 04-12-2015, 01:17 PM   #13
Shark_13
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Originally Posted by MetalHead0723 View Post
Is my previous post about the process of flushing the system correct? That's what I heard is done on a JK, I'm not sure if its the same for a TJ.
Unless you pull the drain plug in the block, there will be about 2 quarts left after the flush in the block.

Personally, I drain from the rad petcock, fill with distilled water, run motor up to temp to ensure thermostat opens and everything cycles. Drain and repeat until clear (3-4 times).
Once you are clear you know there is approx 2 quarts of distilled water in block. Do some math and figure out how much coolant to add to get a 50/50 mix.

I would be concerned with the red in the coolant, sounds like you have a leak.
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Unread 04-12-2015, 03:05 PM   #14
mukluk
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Your automatic trans Jeep in stock form has hoses routing the trans fluid through part of the radiator to cool the fluid, you may have a leak between those two parts. I suggest you check your trans fluid.
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Unread 04-12-2015, 05:57 PM   #15
MetalHead0723
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Originally Posted by mukluk View Post
Your automatic trans Jeep in stock form has hoses routing the trans fluid through part of the radiator to cool the fluid, you may have a leak between those two parts. I suggest you check your trans fluid.
That would explain the reddish tint. Any way I can check the hoses myself without pulling the radiator or do in have to disassemble the system?
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