Could be signs of a cracked engine block or cylinder head
This is the coolant breaking down firs acces the thermostat and removed you will replaced anyway remove the plastic tank and wash best possible disconnect the bottom rad hose and drain and discard the coolant put back together without thermostat fillup with plain water run engine until is warm and empty the system disconnecting lower rad hose careful is hot wait until engine cools down an repeat process as necessary once the water runs clear install thermostat and fill with antifreeze mixture now you have to burp the system
SOURCE: got 98 windstar.brown sludge in
Sounds like the antifreeze is WAY pased the point that it needs to be changed. Should be drained, backflushed and have new installed.
SOURCE: i have brown sludge in my antifreeze resevoir tank
need to flush the radiator first off then check for a blown head gasket or if the runs hott it could be your water pump has seized up
SOURCE: i have a thick dark brown sludge in my antifreez resevoir tank is it oil or really old antifreeze?
Usually antifreeze and oil mixing causes a dark whiteish milkshake consistancy liquid so if its a dark color i'd guess its REALLY old antifreeze with a lot of corrosion from your engine. Get it flushed and changed a.s.a.p. and hope it didnt mess it up to bad.
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