Question about 1992 Nissan 300ZX

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RADIATOR IS RUSTED!

I RECENTLEY PURCHASED A 300ZX AND THE RADIATOR WATER IS REALLY DIRTY WITH BROWN RUSTED WATER!!
I OPENED THE BOTTEM O THE RADIATOR VALVE TO LET OUT THE WATER AND REFILLED IT BUT IT SEEMED TO NOT DO MUCH!! CAN ANYONE TELL ME WHAT I CAN DO TO CLEAN THIS WATER OUT AND FILL IT UP WITH CLEAN!! SO I CAN PUT ANTIFREEZE IN IT!? THANKS. APPRECIATE ANY IDEAS!! :)

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  • NISSAN 300ZX May 30, 2009

    THANK YOU! I WILL TRY YOUR GUYS IDEAS ASAP! AND I WILL GET BAK AT U GUYS TO LET YOU IN ON WAT HAPPEN!! THANKS.. :)

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A radiator flush chemical may be a bad idea if the radiator is rusted up inside.drain out as much as you can, fill with distilled water only, then idle the car till it is at full operating temp. then drain the water and do the same thing one more time. after that, fill with your 50-50 mix of antifreeze/water and that will be about as clean as you can safely get it.

Posted on May 30, 2009

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If it is that bad, replace the radiator and get the system professionally flushed. You will save yourself alot of headaches down the road. Remember to always use a 50/50 mix of antifreeze and water as the antifreeze has rust inhibitors in it as well as lubricants for the water pump. Don't be surprised if after you flush it, you will have a bunch of other leaks spring up due to gettting all the rust deposits out.

Posted on May 30, 2009

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1 Answer

The water comrs bown water is that good


Are you saying that the water in the radiator is brown?
If the water is brown it would indicate rust from the engine which means there is probably no antifreeze which is also a corrosion inhibitor. If the water has a lot of sludge it would indicate a blown head gasket which is not so good.

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How do i flush and replace radiator with anti-freeze ?


Drain the old antifreeze. Add straight water and a chemical flushing agent from a parts store, and follow the instructions for using the flush. Then drain again, and replace the radiator and use a 50-50 mix of antifreeze and water (distilled water, preferably-it is cheap) to fill up the cooling system. Leave the radiator cap loose, and start the engine and let it warm up to operating temperature-the upper hose will be hot after the thermostat is opened, and the coolant level will drop some and need topping up.

It's a good idea to also change the thermostat while you are changing the radiator. If you are not replacing the radiator itself, but a lot of brown rust drains out, then take the radiator off and turn it upside down and flush out good with a water hose.

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My raditor has rust in it or a brown type of water in it how do i get rid of this


The eradicator has what is called a PIT , a small thumb twisting nut on the bottom of the housing. With a pair of pliers, turn it until water flows freely. Open the cap of course to allow air to enter the chamber. Leave it PC valve open and flush until clear water comes out. Close the PC, after all water is emptied out and fill accordingly, remember antifrees solution for protection and rust prevention.

Mar 25, 2014 | 1990 Nissan 300ZX

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Coolant is brown


brow and muddy color usually is a sign of not using enough antifreeze to protect system from rust.
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There is brown sludge in radiator what is the cause do you think


The sludge is due to rust in the cooling system due to lack of maintinance, you will need to have the system flushed, you will need to remove the upper and lower hoses from the engine and run the water hose through the radiator first, you will need to do this a few times, then the next thing would be to remove the thermostant and run water throught the engine, the water will go in from the top, star the engine while water is flowing through the engine dont let engine run to long it will overheat, let it run for about 2 min at a time, then with the thermostat out install the housing and connect hoses, pour some cooling system cleaner into radiator and run engine for about 20 min, then flush out again, then refill and run again with water and then drain it out and fill with coolant, make sure that the coolant is mixed 50/50 coolant and water, you will notice that after it runs for a while it will turn brown again due to build up in radiator and engine, there is nothing you can do about that but atleast the coolant will be good and stop the internal gaskets and radiator from rusting out, you will what to do this again in 6 months to get it cleaner. good day. hope this helps.

Oct 17, 2011 | 1996 Ford Explorer

1 Answer

Replaced radiator on 2001 mazda millenia. now i see the water in the over flow tank is oily and brown in color.


mcdevito75 here, Sounds like you need the cooling system flushed at a radiator shop, the new radiator insatlled is bringing all the dirt from the engine to the recovery container, the brown your seeing is a bit of rust. Have the cooling system flushed at a radiator shop.

Jun 18, 2010 | 2001 Mazda Millenia

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I have an 2001 Mercedes-Benz c240...What color should the coolant be that is used in this car. I paid to have it flushed but the coolant in it looks a greenish-brown color...is this right? Not sure they...


Hi. apparently the mechanic did not rinse the contents out completely after the flushing was administered. During the flushing of a radiator, there may be a good amount of debris that will build up, due to the flushing compounds effect on the crude inside the radiator. This is why there should be a rinsing stage to clean out all that is removed, via the flushing procedure. If the rinse is not done correctly, some of the contaminates will be left behind to mix in with the new radiator fluid. The rust/debris will mix contaminate the new fluid that is poured in, thus, causing the brown color you have noticed.

Most radiator fluids will be green, or orange in color, but never brown or greenish brown. This greenish brown will indicate that there is some rust deposited that were not rinsed out properly, after the flushing of the radiator. I would return the vehicle to the mechanic to request a re-flush of the radiator. They should do it for free.


NOTE_ A more serious issue will be a damaged oil cooler. this will cause the same symptoms within the color of the fluid, if your vehicle is equipped with this device. Once the oil cooler has ruptured, it will cause the engine oil to be transfer into the radiator, thus, changing the color of the fluid.

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Over heating with no signs of leaks. I have a 2001 Toyota Land Cruser that just started to over heat. Liquid is full in radiator and top hose draining back into radiator is hot. No leaking any where I can...


could be a couple of things your thermostat could be faulty or sticking.your radiator or heater core could be getting plugged up to where theres not enough flow or your water pump is goin and last but id check first your belt need to be tighter could be slippin or one more your fan clutch which is just behing the fan could be weak an not driving the fan hard enough.

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1 Answer

Replacing fluids 0n 1996 300zx


radiator antifreeze: open drain **** on radiator and drain refill with water re plug and leave radiator cap off. start vehicle. watch when coolant drops or rises drastically as that is the thermostat opening. at that time re open drain **** and fill radiator with hose water at the same time. when water coming out is completely clear again turn vehicle off and drain radiator again. fill with antifreeze and water mix. 50/50

oil: jack up car, find oil plug, directly behind steering rack on oil pan. undo plug and drain oil into container. while oil is draining remove oil filter. wait for oil to drain completely then re-install drain plug and new oil filter(filled with oil) undo oil cap and pour in oil 4.5 quarts on n/a and 5 for turbo. tighten cap and your done.

brake system: dont attempt, use an experienced mechanic as the lines need to be bled in numerous places including inside the car from the abs module mounted behind the passenger seat.
easy brake system: individually bleed brakes while adding fluid until clear fluid comes out. (not efficient)

a/c: do not attempt unless you have an evac pump for ac systems.

clutch: same as easy brake except using the bleed valves at the slave cylinder and on passenger side fender well.

washer fluid: add fluid and squirt a little to make sure there is no air in the line

Jul 18, 2009 | 1996 Nissan 300ZX

1 Answer

2000 dakota overheating


You can purchase different fluids that will break down rust and corrosion, but if you have a very old or well worn (rusted) radiator it can cause leaks. I once worked on a 15 year old Ford Ranger where the person who had it before ran almost pure water in the radiator. The radiator ended up rusting out in the inside, and the cleaning fluids seemed to really help. It was odd, because the radiator appeared full, but when you went to drain it, only about a half a gallon would drain. It took me multiple applications of the fluids and flushing it about 6-8 times to get it cleared. This may be your problem.

First make sure your engine isn't hot. Typically, you just drain the old fluid in a pan and dispose of it properly. Don't let any sit on the ground or in an open container because animals will drink it.

I then simply place the drain plug back into the radiator, then pour about a mixture of anywhere from 30-50% antifreeze and the rest water. It is preferable that you use distilled water due to scaling.

In colder climates, it is more ideal to have a stronger ratio of anti-freeze verses water. Buy one of the cheap testing bulbs (they run under $2.00) to test your fluid.

Leave the top cap open, start your engine and let it reach operating temperature. When the thermostate opens (evidenced because your fluid levels at the top of the radiator will drop) you will then need to add more water to finish topping the fluid off just below the neck of the cap.

If you have a serious issue with rust, you could possibly look at having a garage flush the system for you. Some shops have the ability to flush the system under pressure. Usually they do only what I described above.

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