My sister owns a 1993 honda civic dx, about a couple years ago I replaced the head gasket and when winter came my sisters boyfriend didn't drain the radiator because it had mostly water and some anti freeze and it froze, when spring came around i looked under the radiator cap and it look like slush in her radiator so i pulled the radiator off and brought it inside to clean it out. When i put the radiator back in and filled it with water, it started up fine and ran fine, i haven't notice any smoke coming out of the exhaust and after a while of driving it i seen brown stuff in the radiator ( is someone pooping in my radiator.... Jk ) Do i have a blown head gasket or cracked head because when i look at the oil it doesn't look like its using oil and every so offen i have to add fluids to the radiator.

 

its most likely rusty water from having only or mostly water in it pal

 

Im betting rust as well. HAve it flushed. How does the oil look?

 

if its an automatic then it is transmission fluid from a bad tranny cooler.... maybe if its not rust