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Coolant is brown

Coolant is rust and brown and muddy colored

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Brow and muddy color usually is a sign of not using enough antifreeze to protect system from rust.
drain the radiator and completely flush the system. use a quality flush system from the auto parts store. after system is flushed so it only flows clean water after draining a few times then empty system and refill with 50/50 antifreeze /water and make sure system is cycled through 5-6 time to make sure air is purged from the system

Posted on Mar 15, 2014


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Is the coolant full ? What year an make an model vehicle ? Are the heater hose's going inside through the fire wall hot to the touch ? What condition is the coolant , does it look like a muddy color. GM dexcool coolant turns a muddy rust color , in fact that's what it is ,an It clogs radiators , heater cores , coolant passages in the engine etc.... An some vehicles have a control valve ,or some call it a hot water valve under the hood in the engine compartment . These valves are in the heater hose and are vacuum controlled . These valves do go bad an the hot water isn't allowed to go through the heater core .

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Engine is overheating even after replacing waterpump,thermostat and radiator cap

If you replaced all that, it very well could be your antifreeze/coolant. Make sure that your coolant level is at a good level, and make sure that it is a normal color. If it is off colored from what it is supposed to be, for example, a brown, or rust color, or a tealish green, flush it and replace it. If that is not the issue, check for any leaks... good luck

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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 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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