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Clean the reservoir and flush the cooling system.
It would start changing the color of the steel into a brownish color, it becomes rust
red brownish
Your coolant should look green. If it's getting rust colored,then it's time to replace it.
Mars is a brownish red because of the rock and the rust from metal on the planet. So, when you see the planet's red, its just 1000 year old rust!
The leaves turned a brownish red as autumn approached.
Transmission fluid, if you have a bad radiator.
If the color is from rust you can test removing with a solution of oxalic acid; but be careful, this acid is toxic.
the oxygen(air)causes the iron inthe apple to rust causing that brownish color.
Never put just straight water in your motor. You want to top off your radiator first then top off your coolant in the reservoir. Water will rust your motor from the inside out.
Look in the overflow container. Is it clear (water) or has a coolant color (usually green) ? Does it feel like plain water or slightly fluid feel ? If overflow or radiator have orange rust color, recommend clean cooling system & replace with new coolant.
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