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Tranny fluid mixed with coolant - 2004 Dodge Neon

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You will need the radiator repaired or replaced. There must be a hole between the the transmission radiator cooler and engine radiator, which can be a single unit

Posted on May 08, 2010

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Transmission cooler inside the radiator cracked
i had a case where i replace the radiator and flush 25 qts of trans fluid thrue the transmission

Posted on May 08, 2010


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Posted on Jan 02, 2017

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SOURCE: trans fluid is low(pink and foamy) must increase

your radiator has gone bang.the radiator is devided in two.1 half is coolant and the other half is trans fluid.the trans fluid runs through the radiator to keep it cool before running through the gearbox.whats happened is the shelf inside your rad has collapsed and your coolant has mixed with the trans fluid and gone into your gearbox and vice versa.expensive job,whole strip down sorry to say mate

Posted on Oct 18, 2009

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How to fix problem of transmission fluid mixing with engine coolant

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If it is transmission fluid it is likely the heat exchanger (or cooler) has sprung a leak. The cooler is often integrated into the main radiator bottom tank. If fluid is entering the cooling system it is possible coolant could be entering the transmission.

Tranny fluid will appear clean and floating on the surface of the coolant and is likely to be pink or red while if it is engine oil it will be an altogether dirtier colour and more viscous. Try capturing a sample with some clean white tissue when the engine is cold.

Engine oil in the coolant could be a sign of a failing cylinder head gasket.
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I have a 2004 dodge neon sx2.0 and last yeah I blew a tranny line and when I took it to a garage they said that my coolant mixed with my ATF fluid so they did all the work and it worked fine for a couple...

Try having a radiator shop look at the transmission cooler inside the radiator to see if it can be repaired. If not, then a new radiator is needed.

May 12, 2017 | 2004 Dodge Neon

1 Answer

We have had to add transmission fluid twice to our vehicle in the past 3 months-no visible leaking-but we are under the impression it must be b.c where did it go?

Check were the engine and transmission meet to see if you have a coating of tranny fluid there. Also check just rear of the tranny, under the car, to see if you have any fluid there. If it is only leaking while driving, then it would blow all over the underside of the car. The only other place it could be going is into the engine coolant since the radiator also houses the tranny cooler. Take a look at your engine coolant to make sure it isn't mixing.

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Transmission oil in the radiator

If the radiator has tranny fluid mixed in with the coolant, then you have an internal tranny cooler leak. At the one side of the tranny, in the saddle tank, there is a tube. This tube allows hot tranny fluid to enter the rad and be cooled before returning to the transmission. It should be totally isolated and submerged in the coolant tank. Occasionally they can leak, and the two fluids will mix. You will need a new rad to repair the problem. It would also be recommended to have the tranny fluid and the coolant flushed after wards. Oil of any kind does not mix well with coolant, and could cause future damage to the tranny more so than the engine.

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New tranny in my 92 ssei now it has tranny fluid in the rad ???????

The transmission and engine are there own entities. Unfortuantly the radiator in some vehicles cool the tranny fluid. Its possable when the coolant lines were disconnected from the transmission or from the radiator, the seal was broken on the radiator where the line goes in from the radiator, so you wont see it because its internal. This will allow trans fluid to enter into the radiator. Be careful with trans fluid mixed with the coolant may cause engine damage. Your solution to the problem if this is infact the source would mean replacing the radiator, if you do this be sure to flush the coolant system to rid trans fluid.

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What type of tranny fluid and anti freeze does the 1999 lesabre take

Dexron Tranny fluid...but your best bet is to read the should say..."good for ALL GM Cars...again with the you are probably mixing some coolant together, your safest and accurate Anti-Freeze would be labeled..."Good for All makes, and colors..." This is the best long term application:) Hope this helps...

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1 Answer

Trans fluid is low(pink and foamy) must increase the revs. to ingage gear .Now I see coolant coming out the overfow that is mixed with tranny fuid.

your radiator has gone bang.the radiator is devided in two.1 half is coolant and the other half is trans fluid.the trans fluid runs through the radiator to keep it cool before running through the gearbox.whats happened is the shelf inside your rad has collapsed and your coolant has mixed with the trans fluid and gone into your gearbox and vice versa.expensive job,whole strip down sorry to say mate

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1998 Ford Club xlt, tranny fluid leak in the coolant.

The lines for the transmission cooler run to the reservoir on one side of the radiator, correct? You may have gotten a bad radiator and the trans cooler is allowing the fluids to mix.

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