-faded-

i just recently drained my radiator and put new fluid in. i have a 01 gsr with a ls/vtec. i now notice that my fluid is getting darker in color in the backup tank( the small clear plastic container over by the intake). it has a black tint to the fluid now. is this something i should worry about? thanks in advance!

xyooj

i dont know if this relates, but in my mom in laws old toyota previa. coolant turned brown imediatly after cycling. turns out it was thermostat.

-faded-

the thermostat is fairly new. maybe 5000 miles at the most

PlastikOwl

it isn't oily is it?

-faded-

kinda looks like oil but i havent felt it. it is pretty dark and my oil is still clear due it only has 200 miles on it since last oil change. i wouldnt guess it to be oil but ill check that out.

dip-set

u drained it but did u flush it(the block)? try doing that with all new rad fluid again..

-faded-

it was drained but not flushed.

dip-set

well what was left in the block is probably what is making the new fluid darker,flush the rad,block,then refill..