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Thread: Oil in Overflow

  1. #1
    Masseylakeboy is offline Cadillac Owners Member
    Automobile(s): 91 Fleetwood Base
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    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
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    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
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    Re: Oil in Overflow

    Suspect oil cooler or trans cooler in radiator.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    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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