Question about Hyundai Motor 2004 Sonata

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Why is my coolant brown

My coolant is turning brown all the time. I had the radiator flushed and I replaced a hose.

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  • 82 Answers

The brown is rust. They did a poor job of flushing. It needs to be flushed with a good acid cleaner. If there are no leaks and it is cooling ok, it will not hurt to run with the brown anti-freeze.

Posted on May 07, 2014

Testimonial: "It is leaking at the bottom drivers side. It is leaking the brown coolant, how would I patch that up?"

  • Jim Akins May 07, 2014

    If it is the hose, tighten or replace hose. If the radiator itself, you have a problem. Take to radiator shop and see if they can repair. Probably cheaper to buy a new one on Ebay. Much cheaper on line than at autopart storel

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Posted on Jan 02, 2017

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SOURCE: the hose from the radiator to the engine has a

depends if its top 1 u will loose some,around 1 pint or less ,if its bottom 1 u will loose most of it!

Posted on Apr 09, 2009

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Trans fluid ed in coolant bottle did flush and two week brown oily goo in bottle


Flush coolant system again. Do you have a brown sludge in the oil. Do this get Preston coolant flush, drain radiator drain coolant tank, fill radiator with water, add the Preston run vehicle for about 15 min remove lower radiator hose from radiator. This will allow all residue to be removed from engine. Replace radiator hose. Fill radiator with appropriate amount of coolant. Disconnect tank from system and let water run through tank until it is clear. Reconnect tank and you should be good. Unless you have oil and coolant mixed which means a blown head gasket or cracked block

Jun 14, 2017 | Cars & Trucks

Tip

How to Flush the Cooling System.


Normally the engine operates at 195F, unless you have replaced the thermostat with another one at 185F. If the temperature has a tendency to rise up, the reason is a partially obstructed cooling system or/and a bad thermostat.The first part of the cooling system that gives up is the heater core, because the coolant flowing channels are thin. It is the time for a coolant flush in your car. To do it right then you need time. Plan ahead for a weekend. With a cooled engine, start with the heater core hoses. Disconnect both of them, but the dirt has to go out of your car, so with a garden hose back flush it and let the dirt to get out of your cooling system. After you will get clean discharge,it is the time for coolant bottle, remove it, discharge the used coolant and clean it. The third to come is the radiator. Open the drain cook, or disconnect the lower radiator hose, and disposal used coolant properly. Now open the radiator cap and flush with water the radiator till discharge will be clear.You think that you are done? Not yet. There is half of old dirty coolant trapped in the system. Install everything, and connect all coolant system hoses, radiator, heater core and coolant bottle. Now you have to run your car with water. Fill out the cooling system with distilled water, start engine, turn on the heater high, and run till upper radiator hose get hot. That means the thermostat opens. Let the engine to cool down, open the radiator cap, and draining cook or lover radiator hose and drain everything. You can use flush detergent, if you wanted, at this stage, but flushing with detergent will add 4 more hours, because the detergent is colorless and you have to guess how many fill and drain processes to do, to get rid of it. I do not do it, but if your cooling system is very dirty you have to do it. After the last drain, fill the cooling system with concentrated antifreeze and 30% distilled water. The reason is because it is more water trapped inside the cooling system. The goal is to reach 50/50concentration. You need a coolant tester to find this. Start the engine and add coolant till radiator is full. Install the radiator cap and bleed the system. After driving you car for a day or so, let engine to cool down, open the radiator cap check the concentration of coolant with the tester, and add antifreeze or distilled water as necessary. It is a good idea to replace the thermostat while flushing the radiator. This procedure has to be done every 2 to 3 years. It is up to you to decide to use RED GM Dex-Cool or GREEN Prestone antifreeze. In all my cars I have replaced Dex-Cool with Prestone, but I flush the system every 2 years, and I never had a cooling system problem in all my cars.

on Nov 14, 2010 | Chevrolet Avalanche Cars & Trucks

1 Answer

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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2 Answers

How do I fix this coolant leak?


This could be a hose or a radiator leak.

And antifreeze is supposed to be bright green or pink for a car of that age. Brown is never a good color for antifreeze--it means car was run with too little antifreeze for a significant period of time and the block and water pump has rusted internally. This is not a threat to the engine block, but it will kill the water pump eventually.

Find the leak, and take appropriate action--if it's a hose, you can replace that yourself and save $. If it's the radiator or even heater core (not likely), it's a trip to the shop for sure, unless you are able to handle the degree of difficulty that goes along with replacing a radiator (about 6-7 on a 10-scale, and usually a major hassle). A radiator shop can fix the leak, saving you new radiator $.

May 07, 2014 | Hyundai Motor 2004 Sonata

1 Answer

97 mercury mountaineering has oil in the radiator and coulant. Help please!


OK, lets figure out what's happening here. You are seeing "oil" in the radiator and coolant. Chances are it is not engine oil. The inly way engine oil can get into a radiator would be if a head gasket was blown. Even then, oil at those locations is not under as much pressure as the coolant is, so when a head gasket blows, what usually happens id that the coolant ends up in the motor oil and oil pan. Verify this by looking at the dipstick to see if it is extremely full. The oil could look like choclate milk. Also, open the oil filler cap and look for signs of chocolate brown goop. I'm betting you won't find that. This is good, but also bad. What you probably have in you coolant is transmission fluid. The transmission oil is circulated through a cooler located inside the radiator. If this cracks or breaks the transmission oil can leak into the coolant. However, at different times the transmission oil and the coolant are at odd with one another pressure-wise. This means that if you have transmission oil in the coolant, you probably have coolant in the transmission oil. This is very very bad, You will need to have the transmission serviced and possible overhauled to repair the damage. You will also need to flush the trans oil from the coolant system. This will require you to replace the radiator, ALL HOSES as well. Coolant hoses do not play well with transmission fluid . The inside of the hose sort of melts and gets real soft and gooey. Changing the hoses and radiator and flushing the motor should work once the transmissionhas been serviced.

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1 Answer

How to back flush heater core 2007 grand prix


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1 Answer

There is brown sludge in radiator what is the cause do you think


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Hi my name is Heath. I have a 1990 Ford Bronco. The other day after i drove it home, I pulled in the driveway and turned the engine off. I got out and heard a hiss so i opened up the hood and I saw brown...


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No heat


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1 Answer

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