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  1. #1
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    Default Coolant flush questions.

    I have finally done the full drain and fill.

    I got a new radiator and heater core 2 years ago. I have noticed some sandy sludge in the neck of the radiator and in the bottom of my overflow bottle. So I drained all the coolant out that I could. I put it into milk jugs and dropped it off the get rid of it properly. So I drained the overflow tank and filled the system with water. I ran it for a while. Then pulled the lower hose again. Then I repeated this over and over until all the coolant was removed.

    Now that the coolant and sandy sludge has been removed from the overflow. Once the sludge was removed from the overflow tank it started leaking. So I bought a new overflow tank. Installed it. Then I bought the Prestone flush and added it with the water into the system. I am running it for a few days in the system. Is this ok?

    Then I will replace the water with coolant and distilled water.

    Is this typical and normal.

    I even removed the thermostat and turned on the heater during this week with just water in the system. I want to clean all the junk out. Because it's not just junk in the system. Its i the water jacket around the engine and in the hoses.
    Last edited by dagod16; 06-06-2015 at 06:06 PM.

  2. #2
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    Default Re: Coolant flush questions.

    Pic of the new and old overflow tank.
    Attached Thumbnails Attached Thumbnails 20150606_105217.jpg  

  3. #3
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    Default Re: Coolant flush questions.

    I would give it all, a good reverse flush with a hose, before the final refill ... dont use too much pressure tho.

    ... and despite Prestones 50% - 70% eth-gly instruction ... I would only use a maximum 50% max , after having had a look at Clintons average yearly weather.
    I hate watching simplicity and reliability being ruined by bureaucracy and technology.

    Quote Originally Posted by MattybPDX
    If my jeep is going to be a grocery getter it's at least going to be a friggin awesome one.

  4. #4
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    Default Re: Coolant flush questions.

    Quote Originally Posted by dagod16 View Post
    Then I bought the Prestone flush and added it with the water into the system. I am running it for a few days in the system. Is this ok?

    Then I will replace the water with coolant and distilled water.

    Is this typical and normal.
    Yeah, looks like you're on the right track. I actually filled back up with hose water, but distilled is waaaaaay better for your jeep.

  5. #5
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    Default Re: Coolant flush questions.

    Well people don't realize it but during the summer we really don't need coolant in the system. We just need water. During the winter is when we just need coolant mixture.


    How do I reverse flush. IF I run water through the whole system plus the cleaner/flush chemical shouldn't that get it all out.?

  6. #6
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    Default Re: Coolant flush questions.

    If you get the whole prestone flush kit, I believe it does the reverse flush.

  7. #7
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    Default Re: Coolant flush questions.

    I just don't want to cut into those heater hoses.

  8. #8
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    Default Re: Coolant flush questions.

    Quote Originally Posted by dagod16 View Post
    Well people don't realize it but during the summer we really don't need coolant in the system. We just need water. During the winter is when we just need coolant mixture.


    How do I reverse flush. IF I run water through the whole system plus the cleaner/flush chemical shouldn't that get it all out.?
    hose water isnt good at all no matter what season it is because of the electrolysis that happens you need some type of lubrication. I run distilled water and some type of additive.. Super coolant is what i use since Lucas sponsors me. but in reality any brand works. and it actually drops about 20 degrees from antifreeze. Plus if you do happen to have a coolant leak it wont leave an oily surface on the street or whatever terrain you are on. So all in all its not terrible for the environment ( i tread lightly ) and it passes tech at a track.

  9. #9
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    Default Re: Coolant flush questions.

    Quote Originally Posted by dagod16 View Post
    Well people don't realize it but during the summer we really don't need coolant in the system. We just need water. During the winter is when we just need coolant mixture.


    How do I reverse flush. IF I run water through the whole system plus the cleaner/flush chemical shouldn't that get it all out.?
    Quote Originally Posted by dagod16 View Post
    I just don't want to cut into those heater hoses.

    As VermOkkult mentioned ... you really ought to have some corrosion inhibitors and additives in there ... even if you dont need the anti-freeze, during summer.

    Its why I use a store bought premix, of about 10/90 ratio .... its a bit easier to find than the non eth-gly mixes ... out in the boonies where I am.

    Most race track approved coolants are eth-gly free.
    See if your local stores have a U.S. equivalent of this stuff ... http://www.nulon.com.au/products/Coo.../#.VXUrgc-qpBc

    As for backflushing ....

    It gets rid of any larger gunk thats pushed up against the inlets - in things like the heater core and radiator.


    If you think your system was fairly clean, then it might not need it ... but I do it to mine regardless.


    No need to cut the heater hoses ... just disconnect 'em and stick the hose in the "outlet" hose.

    Radiator I normally remove, stand it vertical on its inlet end and poke the hose in the outlet fitting.

    Engine ... Remove the thermostat housing and water pump ... and poke the hose in the thermostat position.

    Dont use too high a pressure ... the rad and heater core might not appreciate it ..
    I hate watching simplicity and reliability being ruined by bureaucracy and technology.

    Quote Originally Posted by MattybPDX
    If my jeep is going to be a grocery getter it's at least going to be a friggin awesome one.

  10. #10
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    Default Re: Coolant flush questions.

    Ok I will take off one of the heather hoses and back flush it that way as well. I was going to replace the water with coolant on Tuesday. I just wanted to run it with just water for a week to clean out any remaning yucky sludge/sand. I'm pretty sure it's gone but who knows.

    So anti freeze, and distilled water, and what is this extra additive called? Can I buy it at autozone?

  11. #11
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    Default Re: Coolant flush questions.

    Quote Originally Posted by dagod16 View Post
    Well people don't realize it but during the summer we really don't need coolant in the system. We just need water. During the winter is when we just need coolant mixture.


    How do I reverse flush. IF I run water through the whole system plus the cleaner/flush chemical shouldn't that get it all out.?
    Water causes rust that's why you use coolant during the summer.

  12. #12
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    Default Re: Coolant flush questions.

    Quote Originally Posted by dagod16 View Post
    ....................... So anti freeze, and distilled water, and what is this extra additive called? Can I buy it at autozone?
    If you are going to buy a bottle of, eth-gly, radiator coolant, concentrate or pre-mix ... It will already have the additives in it.


    The only reason we suggested getting the, additives without eth-gly ... was coz you posted,


    Quote Originally Posted by dagod16 View Post
    Well people don't realize it but during the summer we really don't need coolant in the system. We just need water. During the winter is when we just need coolant mixture.

    ... which suggested you werent going to bother with an anti-freeze mix.
    Last edited by Carves; 06-08-2015 at 06:42 AM.
    I hate watching simplicity and reliability being ruined by bureaucracy and technology.

    Quote Originally Posted by MattybPDX
    If my jeep is going to be a grocery getter it's at least going to be a friggin awesome one.

  13. #13
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    Default Re: Coolant flush questions.

    No I will just run water for another day and I will switch back to the pretty green coolant. I just wanted to get all the junk out. Sometimes running it for a few days can still help get junk out.

  14. #14
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    Default Re: Coolant flush questions.

    Quote Originally Posted by dagod16 View Post
    Ok I will take off one of the heather hoses and back flush it that way as well. I was going to replace the water with coolant on Tuesday. I just wanted to run it with just water for a week to clean out any remaning yucky sludge/sand. I'm pretty sure it's gone but who knows.

    So anti freeze, and distilled water, and what is this extra additive called? Can I buy it at autozone?
    The additive is called Water Wetter, Super Coolant, Hyper Lube.. etc.. you can get them at advance or autozone, pretty much any where. The reason i suggest running these additive is since 4.0s tend to run on the hot side, even with antifreeze the addition of the additive claims that it will run up to 20 degrees cooler. Supposedly it runs the coolest with just distilled and additive but i have no proof of this being true just going by the claims.
    Last edited by VermOkkult; 06-08-2015 at 09:05 AM.

  15. #15
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    Default Re: Coolant flush questions.

    I've read that plain water cools best. You add contaminates to raise the boiling point and lower the freezing point.

    Problem with pure water is the rust, then the holes then all that water runs out on the ground.

    I learned the hard way with mine. Ran just water for years.

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