Question about 2003 Dodge Neon

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2003 Neon SXT Tranny Oil In Radiator

About three weeks ago our 2003 SRT Neon was slipping. Then we saw some smoke from engine compartment. We got car to our mechanic's shop. He said that the tranny oil was gettting into radiator and antifreeze was getting into tranny because radiator tranny oil cooler had failed. He replaced radiator with new and flushed tranny and engine several times. Car drove ok after that so we thought it was fixed.
Now today, the car was steaming some from under hood. Upon investigating found antifreeze on top of radiator. Looked under radiator cap and found tranny oil in radiator. Called mecanic and he says tranny oil pressure must be so high as to blow seals on radiator tranny oil cooler. He says probably have to replace transmission. Anyone else ever had this problem in their Neon? Do you know what is causing this?

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  • Seth Lester Mar 15, 2009

    yeah, my radiator also went bad. antifreeze got into the tranny, tranny fluid got into the cooling system, due to an increase in fluids, the tranny-anti freeze mixture got onto the engine and the floor via the overflow.

    When something like this happens, there's 3 things that need to be fixed. First the radiator, because it's broken, duh. One also needs to flush out the tranny fluid from the cooling system. However it's vital to either replace the transmission in extreme conditions, and in less extreme conditions, replace all the seals and gaskets due to the anti-freeze/water mixture wearing them out.


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I'm not possitive but there is usually a vent tube on top of the transmission, may be possible that dirt or something is clogging it up. That would cause the tranny to build up pressure. But to blow the seal on a new radiator, I wouldn't imagine that. My opinion would be that the new radiator wasn't put together correctly. But just in case the vent tube did cause it to let go, check the vent. I hope that you find the problem. Best wishes.

Posted on Jan 17, 2009

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