Black Coolant?
#1
Full Member
Thread Starter
Black Coolant?
First time seeing this, but this is what I drained from my car. It's not separating and doesn't appear to be oily. Should I be worried?
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DaleClark (11-20-22)
#4
RX-7 Bad Ass
iTrader: (55)
^Yep. Do a few drain/fill cycles, probably start with distilled water (90 cents a gallon at the grocery store) until you get it clear then fill up with plain green Prestone 50/50. There's zero reason to use any fancy coolant in an FD, it's designed for green Prestone, use it. Change it once a year and your cooling system will always be happy.
Dale
Dale
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#5
needs more track time
iTrader: (16)
FYI Water wetter type products also cause the coolant or water color to change to an ugly brown color. Could be a factor as well.
Anyway, here's my past experience flushing a dirty cooling system: https://www.rx7club.com/3rd-generati...lushes-977577/
Have fun
Anyway, here's my past experience flushing a dirty cooling system: https://www.rx7club.com/3rd-generati...lushes-977577/
Have fun
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DaleClark (11-22-22)
#6
Racecar - Formula 2000
On top of which other more modern coolants are known to allow/cause corrosion if there is ANY air left in the system. Green ethylene-glycol AF works fine in a cooling system like ours if the air is not totally evacuated.
The following 2 users liked this post by doctorzaius:
DaleClark (11-29-22),
gracer7-rx7 (11-28-22)
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boostin13b (12-10-22)
#11
Full Member
iTrader: (2)
^Yep. Do a few drain/fill cycles, probably start with distilled water (90 cents a gallon at the grocery store) until you get it clear then fill up with plain green Prestone 50/50. There's zero reason to use any fancy coolant in an FD, it's designed for green Prestone, use it. Change it once a year and your cooling system will always be happy.
Dale
Dale
yes yes yes 👍
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