Technical aspects of automobiles

Radiator Resevoir Filled With Grey Gunk…

If a radiator fill resevoir is filled with grey foam-looking gunk, does
that mean oil is mixing with the coolant? This car does not have a
radiator cap.
This is on a 95 Saturn sedan.
Will a flush fix the problem, or will it keep happening?

-supa

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posted by admin in Без рубрики and have Comments (8)

8 Responses to “Radiator Resevoir Filled With Grey Gunk…”

  1. admin says:

    "supafly" <j.supa…@gmail.com> wrote in message

    news:1143548373.734279.133340@j33g2000cwa.googlegroups.com…

    > If a radiator fill resevoir is filled with grey foam-looking gunk, does
    > that mean oil is mixing with the coolant? This car does not have a
    > radiator cap.
    > This is on a 95 Saturn sedan.
    > Will a flush fix the problem, or will it keep happening?

    If that is oil in the overflow reservoir, then the problems are more than
    a flush will correct.

    Every radiator that I have ever seen had a removal cap of some sort
    or another. Maybe I just haven’t seen one like yours, I guess.

    Oil in the radiator can come from a leak from the automatic transmission
    cooler or from a leaking gasket, or crack, in the engine head area.

  2. admin says:

    Many of the newer cars do NOT have radiator caps. There is a pressure
    cap, but it’s not always on the radiator these days.
    It does sound like the poster has a serious problem. If it’s
    transmission oil from a leaky cooler, he could  flush the transmission
    and fix the leak and have a chance of saving the transmission. If it’s
    engine oil, he’s in for a teardown there and a flush will not help.

  3. admin says:

    "Al Bundy" <MSfort…@mcpmail.com> wrote in message

    news:1143555239.640542.265080@g10g2000cwb.googlegroups.com…

    > Many of the newer cars do NOT have radiator caps. There is a pressure
    > cap, but it’s not always on the radiator these days.
    > It does sound like the poster has a serious problem. If it’s
    > transmission oil from a leaky cooler, he could  flush the transmission
    > and fix the leak and have a chance of saving the transmission. If it’s

    Agreed all above.  Every radiator I have seen has had some sort of cap,
    but I am not exposed to as many variants as I once was.

  4. admin says:

    Have you had the vehicle in for ‘service’ lately?   One trick sleaze bag
    shops do is to pour some oil in the overflow tank to imply you need
    serious work like a flush, then when that doesn’t ‘work’, a new head
    gasket, etc…  That is especially sneaky on the closed systems where
    you can’t check inside the rad itself….

    I would clean the gunk out and then see if it comes back.  It doesn’t
    sound like you are losing coolant which could be a sign of head gasket
    issues.

    I would be checking the engine oil and the tranny oil carefully to see
    if it looks milky or frothy.  Water will make a milkshake looking oil.
    It will collect on the dipstick and on the engine oil cap.

    Mike
    86/00 CJ7 Laredo, 33×9.5 BFG Muds, ‘glass nose to tail in ’00
    88 Cherokee 235 BFG AT’s
    Canadian Off Road Trips Photos:  Non members can still view!
    Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
    (More Off Road album links at bottom of the view page)

    - Hide quoted text — Show quoted text -

    supafly wrote:

    > If a radiator fill resevoir is filled with grey foam-looking gunk, does
    > that mean oil is mixing with the coolant? This car does not have a
    > radiator cap.
    > This is on a 95 Saturn sedan.
    > Will a flush fix the problem, or will it keep happening?

    > -supa

  5. admin says:

    If a cyl compression test shows good, then the problem would have to be
    related to transmission, right? (Supposing this thing has a
    transmission cooler–I’ll have to check and see.)

    The transmission has been acting up… hmmm :)

  6. admin says:

    <H…@nospam.nix> wrote:

    > "Al Bundy" <MSfort…@mcpmail.com> wrote in message
    > news:1143555239.640542.265080@g10g2000cwb.googlegroups.com…
    > > Many of the newer cars do NOT have radiator caps. There is a
    > > pressure cap, but it’s not always on the radiator these days.
    > > It does sound like the poster has a serious problem. If it’s
    > > transmission oil from a leaky cooler, he could  flush the
    > > transmission and fix the leak and have a chance of saving the
    > > transmission. If it’s

    > Agreed all above.  Every radiator I have seen has had some sort of
    > cap, but I am not exposed to as many variants as I once was.

    The ’86-’89 Toyota MR2 radiator does not have a cap. The pressure cap
    is at the other end of the vehicle.

  7. admin says:

    a gray-looking "gunk" might be an over abundance of radiator stop leak
    in the system, just

    might be, and / or oil that has tried to mix with the radiator coolant.

    mho

    vfe

  8. admin says:

    on an aside, many radiators are ‘sealed" systems, where the radiator
    itself no longer has a cap, but uses a stand-off reservoir instead. My
    ’89 Eagle has no radiator cap, so the newer "sealed" systems go back at
    least around 15-16 years now.

    However, almost ALL radiators have a drain plug at the bottom of the
    radiator, that may be what’s confusing some of the prob. being spoken
    of.

    Re the original prob., are you losing oil or trans. fluid? Are you
    checking those levels to see if they dropping more than normal for your
    ride?

    In any case, flush the cooling system!!!!! Even if there is a leak, no
    sense in wasting your cooling system in the process!!!!


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