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Message: <blockquote data-quote="Vic Sorlie" data-source="post: 1010967" data-attributes="member: 69241"><p>Take off radiator cap and have a peek.  I'd venture you'll see some of this scum in the radiator.  If you do, I'd say your radiator's failed, allowing coolant and ATF to mix.  I'd ground the car - you're going to need full ATF service (pan drop and the whole nine yards) as well as new radiator and full coolant flush.  Might as well change the oil too, just to be safe.  Coolant in the engine oil or transmission is very corrosive to the soft metals (copper, lead, tin) used in bearings, etc.  Don't put off this one - potential is high here for major damage.</p></blockquote><p></p>