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· No, ...It was NEVER NA!!!
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When I bought my car, the coolant was real rusty. I flushed it untill it was clean. After a few weeks I looked at it again, and its super rusty? I mean, ..I have a half inch of rust settled in the bottom of my coolant reservior.

Whats causing this? Should I have an additive, or some sort of rust inhibitor?
 

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Actually Ive been researching this and is seems common to Toyota using distilled & toyota red.

This thread I linked to helps explain it. In my 1JZ Sc300 I personally use Toyota Red, Distilled water and Redline WW, but yet I still have this brown sludge getting created. It was almost clogging my radiator nipple that runs to the overflow bottle before I cleaned it out, but damn it could clog up the thermostat eventually or worse..

The coolant overflow had this brown soft sand stuff in the bottom..basically the FJ80 guys have done a lot of research into this and have even created a custom coolant filter system since they haven't figured out how to stop the brown sludge stuff from being created.

This shit literally turns into a brown dry powder...just read the link below and you'll see. It isn't oil and I tried the exhaust gas analysis test kit a couple times and I dont have exhaust gas being detected in my coolant as the blue fluid didn't turn yellow at all.

**on the other hand I checked my Supra and someone installed green ethylene glycol at some point, and the coolant overflow is pristine, no signs of the brown stuff at all.

http://forum.ih8mud.com/80-series-tech/96871-serious-sludge-found-overflow-bottle.html


If anyone has any pertinent info after looking at the above thread please let me know although I searched this forum and haven't found any real answer to this mystery.

**honestly, what it sounds like to me is that the Toyota Red is producing a byproduct similar to GM Dexcool(orange 100k BS coolant) Basically, Dexcool if not changed out very often WILL turn into a sand like abrasive substance in your coolant system. Most GM trucks with the plastic remote radiator fill bottle have the crap built up around the radiator cap as does my moms truck right now. Seems that it collects where coolant isn't moving much the most, but it can be suspended in the coolant at all times.

I may flush out all of the Toyota Red and just use the green ethylene glycol cause Ive never seen any byproduct shit ceated from the green stuff.



Join Date: Aug 2004
Location: Folsom, CA
Posts: 90

Ran across this post on the 80's list from a guy in Australia-

"Gday,
I wrote a week or 2 ago about my 1hz overheating up hill. From ringing
around radiator specialists, the likely cause is probably a blocked
radiator and not the clutch fan. The cruiser has only done 150k.
One bloke told me they block up with Aluminium Oxide (or something like
that) from a reaction with the engine. This is in the form of a fine
powder. His advice was to flush the cooling system with straight Vinegar
(cleaning grade). This apparently replaces the protective coat.
Then
drain it and run the engine briefly. The same active ingredient may be in
thoses radiator flush products. I will also replace the thermostat just
to be sure. I will also get the radiator flushed.
Linton"
 

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@ Ryan_V Toyota Red does not produce anything similar to Dexcool sludge. My guess is your problem has to do with using Water Wetter. The only reason people use that stuff is because they aren't allowed to use coolant at the strip. Interestingly enough the person I bought my koyorad from (he used it in a build NA) told me to throughly flush it out and make sure it didn't mix with any of the new coolant.

EDIT: I have also seen reports of WW rusting AL rads.
 

· Im A Fuking Ninja!!!
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I use 30% Toyo Red and the rest distilled water, I also add in 1 bottle of the Redline water wetter, no problem here.
 

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I've had 2JZs with only Toyota Red and I never had this problem...Im thinking your right about water wetter....its not saving me from overheating anyways...

The radiator overflow has this strange chemical smell to it...not a typical coolant only smell.

I'll search around and see what I can find about water wetter...the only thing that may throw this off is if the FJ80 guys aren't using water wetter. How could it be explained then?

I know I read at least one of them used toyota red/distilled water only since new and it still created the supposed aluminium oxide crap. I literally had to use a poker to knock the stuff off the bottom of the radiator overflow last night.

I'm gonna drain the system today and flush with prestone and see what happens.
 

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Quotes from around the inter-web

"Immediately after adding Redline's WW to my old Highlander's cooling system, its Toyota Red coolant started congealing into big tan colored chunks of clotted goo. Had it flushed, and refilled, with no further problem."

"i wouldnt reccomend using it if you are still using the Toyota "red" coolant, i did on mine, and it seemed to slightly gum things up, mainly on the radiator cap. ive flushed it and have had no other problems. i change my coolant once a year, so neglect was not an issue on gumming"
 

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There are a ton of hits on google about water wetter and gunk or sludge. Most of it's hearsay but it is water wetter that causes the issue. Some people say the it's because of Al rad & engines but okay with Fe, others said the gunk is good because it's cleaning out your system but I'm not stupid enough to believe that. Some said using Royal Purple Ice fixed there issue but personally I would just run a 70/30 mix with oem toyota red if you live in the southwest.
 

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I have a 1JZ, I have flushed the entire system twice in a year or so (only with water) and I only use distilled water and Toyota Red, no additives. I get this same "rusty" coolant. I am torn down right now to change all the seals and headgasket (overheating and leaking from everywhere), and when I drained the radiator and lower hose it came out mostly clear and free of the "rust", BUT when I drained the overflow I got the same accumulation of junk and cloudy pink fluid.

The car originally had green coolant when I bought it, I obviously flushed all of it out and put in Toyota Red.

My old radiator (might be the original, car is an 88'), is showing signs that this stuff might be caked inside of it. (I can see it accumulated on the top tiers of the radiator.
I always assumed it was just fine rust from the radiator or cooling passages getting worked loose (they can show up all rusted when they are imported), but now maybe I'm changing my tune.

Could it somehow be the mixture of minute residual green coolant with the Toyota Red? I wonder if I'm just slowly moving out all the crap that accumulated from the previous owner causing some kind of reaction that you guys are talking about.

Anyway, I was going to get my radiator professionally cleaned out this flush, but I'm just buying a new one now in hopes that this crap might be just circulating from my radiator. I'm hoping this flush, rad, and waterpump will solve all problems, I will check when everything is back together and I run it for awhile.
 
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