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Unread 03-13-2009, 02:42 PM   #1
mightydog78
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Brown liquid in radiator???

I randomly opened the cap to my radiator and found some brownish liquid on the cap and sitting around the opening. I can see the antifreeze in the radiator but this brown stuff is freaking me out

Any idea whatthis is? should I go get the radiator flushed at a local shop just to be safe?

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Unread 03-13-2009, 02:45 PM   #2
prjohnson
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Rust??
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Unread 03-13-2009, 02:53 PM   #3
danielgoforth
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Is your fluid still the right color? If so then you don't have a problem.
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Unread 03-13-2009, 02:55 PM   #4
pmccoy9876
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could be stop leak. I know when I used it in my TJ, it kind of stuck around at the cap for awhile.
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Unread 03-13-2009, 02:56 PM   #5
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Sounds like coolant needs a flushing.
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Unread 03-13-2009, 03:10 PM   #6
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Hi dee ho, kids its me Mr. Hanky.
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Unread 03-13-2009, 03:24 PM   #7
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Could be rust or something like Bars Stop Leak. Flush the fluid out and add new stuff.

Good luck.
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Unread 03-13-2009, 05:58 PM   #8
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Unread 03-13-2009, 06:34 PM   #9
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I thought mine needed flushing because it was a rust color (19k miles), after draining it I noticed that Mopar used red anti freeze in it that looked rust colored while in the radiator.
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Unread 03-13-2009, 09:40 PM   #10
mightydog78
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i think ill flush it to be on the safe side

easy to do by yourself? again..im still learning
where is the drain plug located?
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Unread 03-14-2009, 01:51 AM   #11
JakeAW
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Drain plug is on the bottom passenger side of the radiator, it looks like a hose spigot. Just an FYI my radiator fluid always looks brown, I've flushed it yearly for a awhile, I'm not sure what it is, but everything seems to be operating normally. Heater core, hoses, water pump, and thermostat all in good shape. My guess is it's the radiator just being nasty and the stop leak stuff I put in it.

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i think ill flush it to be on the safe side

easy to do by yourself? again..im still learning
where is the drain plug located?
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Unread 03-14-2009, 05:25 AM   #12
JeepJeffW
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Do a search for "radiator flush" and you'll get a couple of methods. Here's mine. Get the flush kit from Prestone if you're going to go that route. It has a diverter that fits in the radiator cap opening and guides the flushed fluid away from the vehicle and, in my case, into a five gallon pail. When you cut the heater hose running along the engine (its the inlet to the heater core) and install the garden hose you will get a complete flush for as long as you want.

On thing I do is add the chemical in the flush kit to the old coolant BEFORE I flush it, run the engine a little to get it dispersed throughout the system, and the let it sit for about 15 minutes before doing the actual flush. While the chemical is doing its thing I kill the time by cutting the heater hose, installing the "T" connector and getting everything ready for the actual flush.

Lastly, after I finish the flush I disconnect both hoses from the heater core and flush it again in both directions, starting with the inlet (top on mine) to insure it is clean.

Regarding the thermostat, I use the 190 (actually a 195 if I remember correctly).
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Unread 03-14-2009, 07:46 AM   #13
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Quote:
Originally Posted by GOLENJEEPTJ View Post
Sounds like coolant needs a flushing.
x2. coolant pH changes over time and eventually turns corrosive enough to eat your radiator, engine block and heater core apart. the brown stuff is the dissolved components of your cooling system. flush & change the fluid before you have to replace someplace expensive.
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