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Reload Thread: Flushing/Degunking a cooling system.

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    Flushing/Degunking a cooling system.

    Hello all. I got a '95 s10 (4.3L 4wd) that was recently passed on to me. The truck run great for the mileage (213k) but I noticed when checking the fluids the other evening the antifreeze looked horrid. From what I could tell from the looks is either a) head gasket leaking (though the oil is fine) or b) a mix match of antifreeze.

    How could I go about flushing all this garbage out of it? I've heard there was solvents out there you could run through it to help clean everything out, but never heard of what they are or where to get them.

    I was also told by someone to look into the Prestone Universal Flush 'n Fill kit [ THIS LINK ].

    A little idea of what I am dealing with:
    The coolant looks a brownish color, as well as tan colored lumps of what looks almost like play doe. The reservoir tank also looks heavily coated in it as well (was empty when I received it). I am assuming there is some blockage as well due to the temp rising and dropping at times while driving. Also the heater seems to have a mind of it's own, it blows out "warm" (not hot in anyway) air out, then seems to cold to a chilly breeze.

    Anyone have any insight on this?

    Thanks in advance!




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    Re: Flushing/Degunking a cooling system.

    Those would be the Radiator Flush in the Coolant isle.




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    Re: Flushing/Degunking a cooling system.

    That brown stuff could be remains from someone putting radiator stop leak in some time in the distant past.

    Bars Leak is brown pellets in a brown fluid.



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    Re: Flushing/Degunking a cooling system.

    Is it chunks or is it a liquid?




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    Re: Flushing/Degunking a cooling system.

    id say just change the fluid...if it was summer you could just run water in there for a bit and then switch back to anti freeze.



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    Re: Flushing/Degunking a cooling system.

    Be careful. someone mixed the orange and green coolant in one of my old vehicles, made gel balls and clogged my heater core and also caused my water pump to fail.



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    Re: Flushing/Degunking a cooling system.

    Quote Originally Posted by -01limited- View Post
    Be careful. someone mixed the orange and green coolant in one of my old vehicles, made gel balls and clogged my heater core and also caused my water pump to fail.
    you mean the mud looking stuff? Dex-cool?



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    Re: Flushing/Degunking a cooling system.

    and btw, even if the oil is fine, your hg could still be bad...



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    Re: Flushing/Degunking a cooling system.

    Yes never mix dex-cool with standard glycol antifreeze.

    Dex-cool is bad if your system is not set up for it. Stick with glycol based antifreeze.



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    Re: Flushing/Degunking a cooling system.

    Quote Originally Posted by pressnic38 View Post
    Is it chunks or is it a liquid?
    It's chunks.




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    Re: Flushing/Degunking a cooling system.

    Quote Originally Posted by CHEMMINS View Post
    Yes never mix dex-cool with standard glycol antifreeze.

    Dex-cool is bad if your system is not set up for it. Stick with glycol based antifreeze.
    well, i know this...

    and dex cool is bad, period.



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    Re: Flushing/Degunking a cooling system.

    Quote Originally Posted by plugitin View Post
    you mean the mud looking stuff? Dex-cool?
    Quote Originally Posted by CHEMMINS View Post
    Yes never mix dex-cool with standard glycol antifreeze.

    Dex-cool is bad if your system is not set up for it. Stick with glycol based antifreeze.
    Quote Originally Posted by plugitin View Post
    well, i know this...

    and dex cool is bad, period.
    idk what it was but after I got the vehicle, 2 moths later it had already ruined my whole cooling system, heater core, radiator and water pump.



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    Re: Flushing/Degunking a cooling system.

    My guess is that it is original coolant, sometimes it can turn that ****** color, lumpy, just from being that old. Seent it. Just change it with 50 50 until summer like above said.



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    Re: Flushing/Degunking a cooling system.

    Its a GM, It came with the Dex cool in it already. The gunky look is what happens to it over time. No services done to it.

    Do this. Open anything and everything you can. Hoses, radiator, Pop the thermostat out housing as well off. And just flush flush flush with a hose of water. Until you get all that crap out. Then replace all hoses. ALL hoses. If its that junked up they will need to be replaced. After that. Add water to it with the coolant flush stuff you can get any place. And run that through there for a good time. Then drain all of that. Replace it with green coolant.


    You wanna get all the Dex cool out before switching it to the green coolant.




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    Re: Flushing/Degunking a cooling system.

    Quote Originally Posted by plugitin View Post
    and btw, even if the oil is fine, your hg could still be bad...

    I do know this (exhaust side). We pressure tested it, the only point we got it to leak was @ 18psi and it was only a slight leak around the water pump mounting. Once I get this all cleared out I will be taking it off, cleaning and resealing it.

    Quote Originally Posted by audioatg View Post
    Its a GM, It came with the Dex cool in it already. The gunky look is what happens to it over time. No services done to it.

    Do this. Open anything and everything you can. Hoses, radiator, Pop the thermostat out housing as well off. And just flush flush flush with a hose of water. Until you get all that crap out. Then replace all hoses. ALL hoses. If its that junked up they will need to be replaced. After that. Add water to it with the coolant flush stuff you can get any place. And run that through there for a good time. Then drain all of that. Replace it with green coolant.


    You wanna get all the Dex cool out before switching it to the green coolant.
    Did the '95's come with Dex Cool?




    Current Project, Chevy S-10:
    Pioneer DEH-P2900MP, Sub Amp: Planet Audio BB1250.1, Sub's: 2x SA-12's, Box: 5.5 cubes tuned @ 32hz, Alpine SPR-17S door speakers, Infinity Kappa 693.9i rear speakers
    More coming soon!
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