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Dark Red Coolant

Discussion in 'Engine & Performance' started by duc1100, Jan 14, 2021.

Sponsored By: Moe's Performance
  1. duc1100

    duc1100 Junior Member

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    The coolant in my 2018 1500 is a dark red. It's got 33k miles and I'm the second owner. The new Mopar I purchased to add to the reservoir is the expected purple. I'm wondering the dark red is due to age or a non-Mopar MS-12106 being added. Any ideas?
     
  2. Brandon-w

    Brandon-w Senior Member Supporting Member

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    Flush it and put all of one type in it. You do not want to mess with mixing coolants. I've seen coolant gel a whole system because of chemical reactions. I don't reccomend taking that chance for a few bucks.

    Sent from my SM-G981W using Tapatalk
     
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  3. MADDOG

    MADDOG Cummins Driver Administrator Supporting Member Military

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    There may have been a change in standard coolant specs as well. But with 33K miles I'd drain, flush and refill.

    Just make sure the coolant spec required for the truck is the spec you purchase for the refill.
     
  4. crazykid1994

    crazykid1994 Senior Member

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    The purple turns red after a while. My 2017 I did a full drain and flush because I lost coolant from something I did and used water to fill it till I could replace the coolant. I’ve had the truck since new so I know nobody touched the coolant. It was dark red. The purple when mixed and after a while it’ll turn red.
     
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  5. Burla

    Burla Senior Member Military

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    take 1/2 cup or better in a glass and take a pic.
     
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  6. duc1100

    duc1100 Junior Member

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    coolant.jpg Left is out of the truck (dark red) and right is the new (purple). I'm aware of the OAT vs HOAT gel issue but suspect this isn't the case. Just curious if other see this. Maybe a "common antifreeze" added to cause the purple OAT Mopar to go red.

    Do need to assess the need to flush. Not sure I can trust the mechanics I've used in the past for other vehicles and not sure I want to do a radiator/heater core/overflow reservoir/flush myself.
     
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  7. crazykid1994

    crazykid1994 Senior Member

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    I did the flush myself and that’s exactly what my coolant looked like before the flush. Not sure why I can’t find my pictures anywhere. Not sure if it’s a tracer they have to help find leaks in the new coolant that loses its color over time or not.
     
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  8. crazykid1994

    crazykid1994 Senior Member

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    Found my pictures. Old coolant in bucket. 50/50 with distilled in the gallon jug

    F7DE4B7A-2953-45A9-A131-32D5571A1794.jpeg

    9D15E7C9-959C-426C-BD8F-8CC5EBDA2E3D.jpeg
     
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  9. duc1100

    duc1100 Junior Member

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    Very cool! Looks like an exact color match to what I'm seeing. Thanks for posting. Provides some peace of mind that nothing is amiss.
     
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  10. Burla

    Burla Senior Member Military

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    normal as shown, no need to flush but since you have some new coolant, why not just empty radiator and fill? keep it fresh.
     
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