Question about 1990 Dodge Dynasty

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Radiator flushing , brownish coolant in reservoir

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  • Master
  • 642 Answers

That brownish color is caused by oxidation(rust) of the waterways in the engine block. Dont worry, your engine wont rust through. This is normal on any car. Just flush it out until the water runs clear. Refill with water and use a good antifreeze as well as it contains rust inhibitors.

Posted on Aug 03, 2010

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  • Contributor
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That is just the color of metal in water sounds okay just old water
check the oil with your fingers to see if there is any water bubbles
if so the head has gone but i dont think so it sounds fine to me

Posted on Aug 03, 2010

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  • Dodge Master
  • 715 Answers

Sounds like the radiator is leaking inside, you need to determine if it is motor oil or transmission fluid. play it smart and do a compression check or you might be towing it.
If it is Trans. fluid would be a radiator.
if it is Motor oil can be alot more complicated, like cracked head or blown head gasket, ect.

Posted on Aug 20, 2010

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Posted on Jan 02, 2017

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2 Answers

If the reservoir tank is filled with coolant, it is necessary also to fill up the radiator with water or coolant?


Depends. Not usually because as engine heats and then cools when shutoff, reservoir should allow radiator to suck back what it needs. However, if you have just flushed system, or replaced water pump, you should fill at radiator as well. Bad radiator cap that prevents backflow can cause problems as well.

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Was the water added to the coolant reservoir or into the radiator? If the coolant reservoir it's a simple matter to unbolt it, drain it, reinstall and refill to proper level. If water was added to the radiator, it's best to drain the coolingg system and refill with the proper 50/50 mix of Dexcool. Water in the radiator will not hurt anything in the short term, but will not provide adequate protection.

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What should i do if the coolant in my radiator is brown looking


Being a 1992, If you have never had it flushed I would highly recommend having the cooling system flushed and refilled. It just depends on how severe the coolant strength and color is. New coolant is pink or orange in color and you may have one of these installed in your engine or mixed with the old green coolant and the color will be brownish. If thats the case I would still recommend getting it flushed the 2 different coolants don't mix well and cause it to gel in heater cores and small passages.

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3.0? you most likely overheated the engine, warping the heads.
Having the head gaskets replaced may fix this.
Get it looked over.

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