Antifreeze on the PCV Valve
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HT4100 4.1, 4.5, 4.9 Discussion, Antifreeze on the PCV Valve in Cadillac Engine Technical Discussion; I noticed on the bottom of the PCV valve and inside the plastic tube that it goes into is a ...
  1. #1
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Antifreeze on the PCV Valve



    I noticed on the bottom of the PCV valve and inside the plastic tube that it goes into is a light brown coolant smelling residue. So it looks like the PCV is picking up coolant from somewhere however dipstick looks normal and the car runs cool. I'm thinking intake gasket.... Any thoughts?

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Antifreeze on the PCV Valve

    That's not coolant - it's moisture and oil mixed. It looks like loose snot. Exactly what a PCV is supposed to suck up when the car is used for mainly city driving in cool weather and the engine guts never warm up enough to boil off all the condensation and acids which accumulate from the combustion process. You might also find the stuff on the inside of the oil filler cap.

    Get outta town and take a 150 mile round trip for a margarita, come home and change the oil and filter, using the recommended oil for your engine in whatever type - dino or synthetic - that floats your boat.

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    Sevillian273's Avatar
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    Re: Antifreeze on the PCV Valve

    HAHA I just logged back into the thread to mention that it is on the filler cap too!!! Well thanks, thats a relief. It does have a light bleach / old coolant kind of smell.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Antifreeze on the PCV Valve

    My wifes '96 Bonneville (3800) has had that on the cap for the last 13 years I've owned it every winter. I can actually see water droplets on the underside of the cap, even if I drive it to work 40 miles at 70 MPH. I can't figure it out. It should not do that.

  6. #5
    drewsdeville is offline Cadillac Owners Master
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    Re: Antifreeze on the PCV Valve

    As long as the oil itself doesn't look the same, I agree with the above replies.

  7. #6
    Sevillian273's Avatar
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    Re: Antifreeze on the PCV Valve

    It was that sweet candy/ chemical smell that set me off along with the fact that half the intake gasket is under the rocker cover.

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