Antifreeze turns brown after running the vehicle


Asked by Dec 07, 2014 at 09:28 AM about the 1994 Oldsmobile Cutlass Ciera 4 Dr S Sedan

Question type: Maintenance & Repair

After I have flushed the vehicle's anti-freeze twice the anti-freeze still turns brown after the vehicle is driven for a while. What is causing the anti-freeze to turn a muddy brown color?

1 Answer


There are two types of coolant flushes - chemical and water. The chemical flush is much more thorough than the water flushing. Most of the time flushing with water consists of draining the system and running water from a hose through it for a couple of minutes and then refilling it. That won't get all the rust and grime out of the system.When you add the new coolant, the cleaning agents in it are then doing their job and removing more rust and grime. That is one of the functions of radiator fluid, as it contains rust inhibitors and cleaners in addition to anti-freeze. I'd try to do another flush, with a chemical cleaning agent which you can get at any auto parts store. Dump it in and run the vehicle for a while, drain the system and repeat, then give it a final flush and refill, be sure to use the exact recommended coolant for your vehicle too.

Your Answer

Add photo

Related Questions

Search Oldsmobile Cutlass Ciera Questions

Oldsmobile Cutlass Ciera Experts

#1 dandyoun
Reputation 200
#2 Tom Demyan
Tom Demyan
Reputation 150
#3 tennisshoes
Reputation 140
View All

Related Models For Sale

Used Buick Century"
1,269 listings starting at $3,295
Used Chevrolet Camaro"
798 Great Deals out of 38,822 listings starting at $2,650
Used Honda Accord"
1,258 Great Deals out of 78,695 listings starting at $1,400
Used Pontiac Grand Prix"
30 Great Deals out of 4,357 listings starting at $1,995
Used Hyundai Elantra"
834 Great Deals out of 50,788 listings starting at $1,995