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Dark brown / black coolant?

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Old 02 Feb 2023, 07:12 am
Fresh Cruiser
Join Date: Aug 2009
Location: Huntsville, AL
Posts: 21
Default Dark brown / black coolant?

I drained my radiator yesterday and what came out was very dark brown, almost black yet it had a coolant smell. I drained about 6 quarts and added back that amount of distilled water. I’m gonna drive it about 50 miles today and then I’ll drain it again, and probably repeat the process until what I drain is clear, clean water at which time I’ll add full strength Zerex G05.

Any idea what this black stuff is?
1970 Dodge Challenger R/T - under construction
1970 Dodge Daytona Clone - under construction
1979 Dodge Ramcharger 360/727/4x4
1989 Dodge Shelby Dakota
1993 Dodge D250 Cummins Turbo Diesel
2004 Jeep Grand Cherokee Limited
2006 PT Cruiser GT Convertible 5 speed
2007 Dodge Charger R/T Daytona
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Old 02 Feb 2023, 07:36 am
Fresh Cruiser
Join Date: Jul 2008
Posts: 33
Default Re: Dark brown / black coolant?

My guess would be the previous owner used different coolants at the same time. The recommended HOAT coolant is orange/yellow in color. This mixed with the standard green color could result in a darker brown color.
This is purely a guess though.
2003 Electric Blue Touring Edition (Sold Nov. '10)
2003 Bright Metallic Silver GT Wagon (Sold Apr. '11)
2004 Black GT Wagon (Current)
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Old 02 Feb 2023, 03:23 pm
rcktpwrd's Avatar
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Join Date: Jan 2011
Location: Raleigh, NC
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Cool Re: Dark brown / black coolant?

I agree, probably mixed incompatible coolants.

2001 PT Cruiser 5-speed; 1976 Oldsmobile Cutlass S; 1990 Chevy 454SS; 1995 Caprice Classic woody
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