Oil in Overflow

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Oil in Overflow in Past Cadillac Vehicle Discussion; I have a 91 Fleetwood. I recently found oil in the radiator overflow. The oil and trans fluid looks normal. ...
  1. #1
    Masseylakeboy is offline Cadillac Owners Member
    Automobile(s): 91 Fleetwood Base
    Join Date
    Mar 2013

    Oil in Overflow

    I have a 91 Fleetwood. I recently found oil in the radiator overflow. The oil and trans fluid looks normal. I have hoses coming off the radiator that have oil all over them. I am also getting a service A/C light when I turn the A/C on. Could the air not working cause this leak into the overflow or is it the radiator?

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  3. #2
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Master
    Automobile(s): 98 DeVille, 97 DeVille d'Elegance
    Join Date
    Feb 2012

    Re: Oil in Overflow

    A/C has nothing to do with it, they are 2 completely different systems.

  4. #3
    aeronca36606 is offline Cadillac Owners Enthusiast
    Automobile(s): 85 Coupe Deville 4.1 V8 & 4.3 V6 Deisel & 1970 Eldorado
    Join Date
    Sep 2005
    East Tennessee

    Re: Oil in Overflow

    Suspect oil cooler or trans cooler in radiator.

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  6. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Oil in Overflow

    By the way, if oil (or trans fluid) is leaking into the coolant, coolant will leak into the crankcase (or trans) after shutdown. The engine will tolerate oil (or trans fluid) in the coolant, but the engine (or trans) will not tolerate coolant in the oil (or trans fluid) for very long.

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