Strange liquid sound after engine is turned off

Engine, Transmission & Driveline

  1. Geddylee

    Geddylee New Member

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    Heya,

    I would kindly ask you guys for advice - maybe you have an idea here :(

    Last saturday I parked my 1967 Newport after a 45 minute ride on an highway...round about at 65 mph. (outside temp was about 90 F)
    I was quiet surprised after I heard that sound when I opened the hood - literally sounds like pot of spaghetti cooking.

    The car was running ok all the time, no oil pressure warning etc.
    I am wondering if this is oil...or if it is cooling water ?
    probably it is bubbling from the fuel ?

    has anyone ever noticed that ?

     
  2. detmatt

    detmatt Old Man with a Hat FCBO Gold Member

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    That’s your cooling system. It sounded like some of it was hitting the floor too, yes?
    My guess would be your cooling system needs to be flushed. It may not be flowing properly.
    Does your temp gauge work?
     
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  3. jct

    jct Senior Member FCBO Gold Member

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    No temp gauge on the car only id10t hot and cold lights
     
  4. Geddylee

    Geddylee New Member

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    Hi,

    yeah, unfortunaltely there is no real gauge, just as @jct mentioned. By the way there was no cooling liquid hitting the floor.
    Yesterday I checked the coolant level after the car sat overnight.
    After removing the radiator pressue cap the fluid level was about 1.5 - 2 inches below the filler neck, so that the top of the upper plate fin was visible.
     
    Last edited: Aug 26, 2019
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  5. rkrochen

    rkrochen Well-Known Member

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    I agree it sounds like your coolant which is probably boiling. Get yourself a temp gun go for a drive and check the temp of the engine. I usually point the laser at the base of the thermostat. Do this before you shut the engine down and again after shutdown.
    You will likely see it gets quite hot.
     
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  6. ceebuddy

    ceebuddy Well-Known Member

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    If you shut down the engine after driving in warm weather, isn't it nromal for the water to do a littlebit of boiling?
     
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  7. mr. fix it

    mr. fix it Old Man with a Hat

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    It's known as "After Boil" and is or was quite common if your coolant is not properly mixed having more water than anti-freeze.
    I would not only test the mix but do the other items as was listed above if there is any doubt in the age, or cleanliness of the coolant.
     
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  8. Geddylee

    Geddylee New Member

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    Thanks for the replies...I guess I will first of all swap the coolant. I got the car in may this year, at that point the coolant level was pretty high and in the first time
    the car was just spitting the coolant through the overflow hose. I am not sure how old the coolant is, it looks yellow/greenish but you never know.
     
  9. LeBaron1973

    LeBaron1973 Senior Member FCBO Gold Member

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    A suggestion- why not install an coolant overflow bottle system like moderm cars, never lose coolant that way, but do what the guys suggest and get the system sorted out first.
     
  10. rkrochen

    rkrochen Well-Known Member

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    Also replace your rad cap. The pressure created by the cap raises the boiling point which will help in this case. If you decide to add an overflow make sure you put a cap on designed for an overflow system. Regular caps will not allow the coolant to be sucked back into the rad.
     
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  11. Fury440

    Fury440 At my age everything's a good idea FCBO Gold Member

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    I had the same after boil problem. I added an overflow bottle like this.
    P1050634.JPG
     
  12. 3C's & a D?

    3C's & a D? Well-Known Member

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    Sounds like blockage somewhere, how does the rad look? Any green showing? If after cooling down you can see the top plate inside the rad you're losing too much fluid, it should be about a half inch above it. Air bubble somewhere? Heater core valve not completely opening?
     
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  13. fury fan

    fury fan Senior Member

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    Never heard that much gurgling before, not even on cars of mine that ran hot.
    As mentioned, get the AF flushed and verified 50/50 mix in there, and get a $15 temp gun - a cheap tool for sure.

    I'd also recommend adding oil press and water temp gauges under the dash somewhere, either mechanical or electric, whichever you prefer.

    Some folks may say they do not like the appearance, but when driving a 40+ year old car it is mandatory to be able to collect at least a little data of what's going on to diagnose problems. A mechanical water temp gauge can actually show you when the T-stat opens, closes, opens, closes... And you can see the needle swings get smaller and smaller as the engine temp heads toward equilibrium. Good stuff!
     
  14. Snotty

    Snotty Senior Member FCBO Gold Member

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    Bad cap letting in air.
     
  15. stubs300

    stubs300 Senior Member

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    You just answered your own questions, you don't know the condition of the cooling system! Do as others have said, flush it real good, T-stat, hoses if needed. Inspect the rad itself, maybe pull it out when empty and shake it and hear how much rust/crud might be in it. You might surprise yourself at what you might find. Good Luck
     
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  16. Geddylee

    Geddylee New Member

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    I have just been to the Garage to check the fluid level today (I refilled yesterday)

    I really appreciate your hints.. I'll start to work the hints you gave me. The previous owner just used an orange juice plastic bottle to collect the overflow. The underhood picture from @Fury440 looks pretty nice. I'll check on RockAuto for that.

    And here is a pic of the fluid level where you can see a bit of the rad. Since this is my first car with 50+ I am not sure if the rad looks 100% ok in comparison to it's age.. the inside colour looks rusty

    IMG_20190826_200442.jpg
     
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  17. mr. fix it

    mr. fix it Old Man with a Hat

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    You will need to convert to a closed system rad cap if you go this route
     
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  18. Jon O.

    Jon O. Well-Known Member

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    After you replace the fluid, park it on a steep incline. Let it cool, then take the cap off. Start the car and wait for the thermostat to open. This should take out the air. Just make sure your car doesn't roll away.
     
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  19. stubs300

    stubs300 Senior Member

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    On a cold motor, all your junk is going to be sitting in the bottom of the tanks and block. Your coolant looks fair, who knows what it looks like hot & stirred up, but like I said. You don't know the condition let alone the freeze point of it. Just do it before it get to cold and the snow fly's that could make your matters worse if that stuff freezes. You can thank us later. Good Luck
     
  20. odcics2

    odcics2 Active Member

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    If in doubt, flush it out.