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1999 Ford E-250 Question: coolant & motor oil mixing in radiator

 

Question

coconut69, Houston, TX, February 12, 2011, 09:47
 Rookie

the engine runs great but the oil & coolant are mixing & pouring into the reserve bottle but not in the engine.

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  • Answer #1

    February 12, 2011, 10:00
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     Master

    Looks like you have a bad oil cooler. Replace the cooler, flush the entire cooling system - you might need to do it more than once - replace the missing oil and that should be it.

    Zee

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  • Answer #2

    patrick mannion from Greg Solow's Engine Room, February 12, 2011, 10:02
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     Master

    I just looked at the workshop manual on the 4.6 and 5.4L engine both have an engine oil cooler on the side of the engine (at oil filter) with coolant hoses attached to it. Perhaps the oil cooler is leaking and allowing the transfer of oil into the cooling system. This problem is only going to get worse and needs to be fixed immediately. The cooling system will have to be thoroughly flushed out as oil will damage rubber coolant hoses.

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  • Answer #3

    Cliff's Car-Tech (44 Answers) , Houston, TX - (281) 845-2492
    Teri Smith February 14, 2011, 07:29
     Technician

    i agree w/ other responses, failed oil cooler. easy enough to replace.

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