Question about 2001 Chrysler Town & Country

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Transmission oil in coolant? - 2001 Chrysler Town & Country

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  • wjmlm Jul 17, 2008

    I was driving and the temperature gauge alarm sounded. pulled over, opened the hood and there was trans. oil/coolant mixture coming out of the coolant overflow tank.

  • Dave May 11, 2010

    you poured it in by mistake or it has made it's way there by other means??

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Trans fluid can get into radiator by the trans cooler built into radiator side, automatics...
Engine oil can come thru cracked block, head gaskets

Which oil is it? Either way it needs to be fixed.

Typically with automatic trans they can overheat and cause engine temp issues, because they cool thru the radiator using an in tank cooler along side.
IF you overheat the trans you CAN overheat engine
IF you overheat the engine you CAN overheat the trans

Posted on Aug 06, 2008

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Usually oill in the coolant means the head has cracked or at best you have blown a head gasket. I would have thought it was engine oil not tranmission fluid though

Curious about the colour of the oil in the coolant...

Check the engin oil filler cap and also the dip stick for traces of coolant. there will usually be a whitish creamy sludge evident especially on the oil filler cap.

Either way you need a mechanic to repair it I'd think unless you are a serious do it your self home mechanic.

Posted on Jul 17, 2008

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3 Answers

I have a slight amount of oil in my radiator, I had this years ago and my dealer fixed it and said it was something small. Anyone know what it maybe or had the same experience. Thanks


This is a concern that requires immediate attention. Oil in the coolant or coolant in the oil is an indication that the integrity of the engine has been compromised and a passage has developed between the oil and coolant.

Installed in some radiators is a transmission coil cooler that is connected usually at the bottom of the radiator by two metal tubes. A failure internally of the radiator could breach the separation.

Head gaskets that have coolant pass through openings can also be a failure allowing the liquids to mix.

Look for coolant in the engine oil.
Check for oil level overfull

Look for steam from exhaust

Hope this helps.

Have repair done ASAP at qualified shop
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26313575-w3itrvjrcoc1z5s35x2k3yfd-1-2.jpeg
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26313575-w3itrvjrcoc1z5s35x2k3yfd-1-5.jpg

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tdisline_495.jpg
The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):

tdisline_496.jpg
In the picture above the transmission oil pan was removed for oil filter replacement.

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If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:

9d86426.jpg

The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):

138b4e6.jpg
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