Radiator fluid
#4
RE: Radiator fluid
Take a sampe of your coolant, sometimes the coolant expansion tank turns brownish. The coolant should be a vibrant pink color. If your coolant is indeed brown, stop driving the car and have it looked at.
#9
RE: Radiator fluid
Also, how long has this been your car?? The previous owner may have mixed green coolant with red, which turns the mixture brownish. If that is not the case, there are three issues that could cause this...blown head gasket (worst), blown oil cooler (bad), or yellowed/browned expansion tank (best!).