There is only one thing that comes to mind on your problem of a milky coolant and it isn't good news. I am leaning towards you having a cracked block, a cracked head or a blown head gasket. What it sounds like is that engine oil is mixing with your coolant. There are only a few places where this can take place, which I have mentioned. I would run a pressure check on your colling system and watch for the pressure to slowly go down. Also look for milky oil contamination. I wish you the best of luck.
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Check your dipstick to see if the oil has a milky appearance. If so there is coolant in your oil and you probably have a blown head gasket. If the oil looks normal and the fluid you described as brown looks the same as the color of your motor oil ( a bit dirty ) you have either blown a head gasket or craked the head. If your vehicle has an oil cooler you may have a leak in the lines to it or a leak in the cooler itself. There is also a type of refridgerant ( from your ac system ) that will turn brown when exposed to air.
Turbid
It will probably overheat. answer= thermostat will not open and will prevent the flow of coolant . which will in turn do damage to your engine
most likely red
to turn pink into a terra cotta color mix pink and brown and a little bit of red