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E270 CDI Auto. Gearbox oil contaminated with engine coolant. ( 140,000 miles ) What would be the cheapest remedy ?

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  • anthony983 Aug 10, 2008

    The engine coolant is getting into the gear box , not gear box oil into the coolant .

  • anthony983 Aug 10, 2008

    Yes , unfortunately this is the solution. many thanks .

  • Anonymous Mar 22, 2014

    small drip front and aft engine where parked. No detected source. Whet traces between engine heads, under thermostat housing, but this dry.

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Hi,

To my knowledge on an E270, the transmission oil cooler is co-located with the radiator system. It has been known that coolant (being at a higher temperature and higher pressure) can force its way in to the transmission fluid/oil cooler. This is more common with those models/units fitted with Valeo radiators. Others of a different supplier are not as common.

The easiest/cheapest would be to determine where the leak is and plug weld it. This is component level repair and you might be better off seeking the services of radiator repair persons or those who repair evaporators and condenses of refrigerators/freezers. Both are knowledgeable about tube/pipe welding. Additionally, most automatic transmission could be flushed, cleaned and new automatic transmission oil/fluid poured into. Of course it is not known the lasting effect of the contamination.

The technically correct procedure would be a replacement though expensive (heard around 10KUSD) and dealer performed.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 10, 2008

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The only conceivable way for coolant getting into the gearbox is through the gearbox cooler which is sometimes mounted "from the factory" inside the radiator.

If this internal cooler is cracked or damaged, it could be allowing coolant into the transmission lines going back to the transmission.

This is a serious problem. You may be able to replace or have repaired the radiator.

You would not want to drive the vehicle like this as you could damage your transmission!

Good luck

Brian

Posted on Aug 10, 2008

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The cheapest remedy is to bypass the radiator and install an external transmission cooler.The radiator has a built in coolant tank for the transmission fluid,and apparently the tank has a leak,allowing coolant into the trans fluid.Water based coolant is very bad for a transmission,and in addition to bypassing the radiator,the trans should be flushed with a total flush machine to remove ALL of the old fluid and coolant from the trans.You could install a new radiator and also repair the problem,but the cheapest fix is to just leave the radiator there,and bypass it.make sure the old inlet and outlet on the radiator are blocked off,as they will eventually leak coolant if left open.Good luck.

Posted on Aug 10, 2008

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If its auto the radiator is gone its letting coolant in there though the pipes on the side of the radiator there is no cheap remedy u have to get a second or brand new radiatior

Posted on Aug 10, 2008

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You could have 2 issues,Either the radiator has cracked therefore letting transmission fluid into the coolant or the head/head gasket is bad.If the car overheats,blows white smoke from the exhuast id say look at the head,if not it may be the radiator,let me kmow.

Posted on Aug 09, 2008

  • anthony james
    anthony james Aug 10, 2008

    I told you it was either the radiator or head.

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SCHEDULE "A"
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- Replace engine oil filter.

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