Mcw0ng

iTrader: (1)

After 18 gals of distilled water....

DaleClark

iTrader: (55)

WOW. That was SERIOUSLY overdue!

I recommend everyone change coolant out once a year. Doesn't take much time or cost much but makes a HUGE difference.

Dale

silverTRD

iTrader: (37)

Jeez I’ve bever seen coolant that dark

DaveW

I've been changing ~50% of mine every year - I drain the radiator and refill with 50/50 green AF and distilled water. That way the anti-corrosion additives get replenished every year. I've been doing that for ~20 years now on both the FD and my '74 Chevy Van that is my F2000 racecar's tow vehicle. Doing it this way is very quick, easy, and seems to be effective. The coolant always looks new when I drain it.

edd956

Nice!

Mcw0ng

iTrader: (1)

Yeah, I've never seen black coolant before as well. Later down the road will change out the radiator. The car has 41k miles and I don't think the coolant has ever been changed.

EREBUS

Unless he used prune juice for coolant

mikejokich

iTrader: (1)

I just flushed my system with Thermocure, which is a chelating agent that binds iron(rust) into solution, and it turns black just like this. It did make a difference in cooling efficiency. Likely cleaned some of the old corrosion and rust, particularly for the side iron cooling channels on my 15 year old keg.
Mike

gracer7-rx7

iTrader: (16)

Looks a lot like mine but you got a better pic
Took me 14 gallons
https://www.rx7club.com/3rd-generati...lushes-977577/

SpinningDorito

iTrader: (2)

Oh geeze. I've gone through ~10 gallons and mine is still coming out pretty dark. I've never seen a coolant system as mucked up as mine was though.

silverTRD

iTrader: (37)

I think I’d rebuild if my coolant was that dark, I’m so paranoid hahaha

Sgtblue

iTrader: (16)

I forget now who it was here that convinced me, but since my coolant seal failure 12 yrs ago I've been changing it out annually. Part of my spring coming out routine...scheduled for this week.

That'll make your tailpipe raw.