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    Coolant flush question

    Had to do multiple flushes to my rusty cooling system after I got an air bubble and had to add a bunch of water in an emergency. I was wondering the best way to make sure all of the air is burped out of the cooling system, I put 2 gallons of the total 3.5 gallon capacity back in so far

    #2
    A ton of it stays in the heater core and block, even if nothing else comes out of the radiator.

    I've never had a problem with these taking coolant. I can usually get 80%+ of what came out back in. I drive it around for a couple miles, let it sit overnight, and check it again the next day to add any additional. I do use thermostats with a hole in them to potentially prevent those air bubbles.
    1990 Country Squire - weekend cruiser, next project
    1988 Crown Vic LTD Wagon - waiting in the wings

    GMN Box Panther History
    Box Panther Horsepower and Torque Ratings
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      #3
      Originally posted by Tiggie View Post
      A ton of it stays in the heater core and block, even if nothing else comes out of the radiator.

      I've never had a problem with these taking coolant. I can usually get 80%+ of what came out back in. I drive it around for a couple miles, let it sit overnight, and check it again the next day to add any additional.


      Well right now the heater core is bypassed due to it leaking, and I probably just didn't get enough back in it the first time chasing leak after leak

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        #4
        Originally posted by Tiggie View Post
        A ton of it stays in the heater core and block, even if nothing else comes out of the radiator.

        I've never had a problem with these taking coolant. I can usually get 80%+ of what came out back in. I drive it around for a couple miles, let it sit overnight, and check it again the next day to add any additional.


        Well right now the heater core is bypassed due to it leaking, and I probably just didn't get enough back in it the first time chasing leak after leak

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          #5
          Ugh, my internet is sucking and I end up with double posts

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            #6
            Originally posted by 91merc View Post
            Ugh, my internet is sucking and I end up with double posts
            Might be the forum. I've seen several double posts in threads.

            I've usually just filled the radiator to the top of the core, ran the car with the cap off while maintaining that level until the thermostat opened, then topped off the radiator and overflow tank appropriately. Then effectively do what Tiggie said, follow all that up with a test drive and overnight rest and check level in the morning.


            My Cars:
            -1964 Comet 202 (116K Miles) - Long Term Project
            -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
            -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
            -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

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              #7
              Normally it would call for about 1.7 gal of straight coolant so I would add maybe 1/2 Gal more of straight coolant before adding any more water.
              03 Marauder DPB, HS, 6disk, Organizer Mods> LED's in & Out, M&Z rear control arms, Oil deflector, U-Haul Trans Pan, Blue Fuzzy Dice
              02 SL500 Silver Arrow
              08 TC Signature Limited, HID's Mods>235/55-17 Z rated BFG G-Force Comp-2 A/S Plus, Addco 1" rear Sway, Posi Carrier, Compustar Remote Start, floor liners, trunk organizer, Two part Sun Visors, B&M Trans drain Plug, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17
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                #8
                Another question, how exactly does it draw coolant out of the overflow tank? Does it draw a vacuum or something when the cooling system pressure goes back down after being hot?

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                  #9
                  Yes you are correct. When it is hot it blows into the overflow and it sucks when it cools.
                  03 Marauder DPB, HS, 6disk, Organizer Mods> LED's in & Out, M&Z rear control arms, Oil deflector, U-Haul Trans Pan, Blue Fuzzy Dice
                  02 SL500 Silver Arrow
                  08 TC Signature Limited, HID's Mods>235/55-17 Z rated BFG G-Force Comp-2 A/S Plus, Addco 1" rear Sway, Posi Carrier, Compustar Remote Start, floor liners, trunk organizer, Two part Sun Visors, B&M Trans drain Plug, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17
                  12 Escape Limited V6 AWD, 225/65R17 Vredestein Quatrac Pro, Winter 235/70-16 Conti Viking Contact7 Mods>Beamtech LED headlight bulbs, Husky floor liners

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                    #10
                    the trick there is the cap must be good, and the hose to the overflow tank can't be cracked or have a bad fit to the radiator otherwise it just sucks air instead of coolant. There are two seals on the cap, the lower one seals to the pressurized part radiator, the spring above that is your pressure regulator, and the top seal is what forces coolant to move in and out of the overflow tank. If the lower one is bad it doesn't build pressure, if the upper is bad it doesn't burp properly.


                    but yeah I haven't had any particular issue getting air out of these either. If you still have the EGR cooler hoses hooked up, remove one of those while filling the radiator. When coolant starts to come out, put it back on. That will eliminate a whole lot of the air.

                    Another trick, if you have one of those fail-safe thermostats with the little hole, put the hole at the top of the thermostat. Or just drill a 1/16" hole in a standard one. Same idea, it will let air come out of the block instead of trapping a bubble at the top of the engine until the thermostat opens.
                    86 Lincoln Town Car (Galactica).
                    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                    91 Lincoln Mark VII LSC grandpa spec white and cranberry

                    1984 Lincoln Continental TurboDiesel - rolls coal

                    Originally posted by phayzer5
                    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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                      #11
                      the trick there is the cap must be good, and the hose to the overflow tank can't be cracked or have a bad fit to the radiator otherwise it just sucks air instead of coolant. There are two seals on the cap, the lower one seals to the pressurized part radiator, the spring above that is your pressure regulator, and the top seal is what forces coolant to move in and out of the overflow tank. If the lower one is bad it doesn't build pressure, if the upper is bad it doesn't burp properly.


                      but yeah I haven't had any particular issue getting air out of these either. If you still have the EGR cooler hoses hooked up, remove one of those while filling the radiator. When coolant starts to come out, put it back on. That will eliminate a whole lot of the air.

                      Another trick, if you have one of those fail-safe thermostats with the little hole, put the hole at the top of the thermostat. Or just drill a 1/16" hole in a standard one. Same idea, it will let air come out of the block instead of trapping a bubble at the top of the engine until the thermostat opens.
                      86 Lincoln Town Car (Galactica).
                      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                      91 Lincoln Mark VII LSC grandpa spec white and cranberry

                      1984 Lincoln Continental TurboDiesel - rolls coal

                      Originally posted by phayzer5
                      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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                        #12
                        And yes... the forum was having host issues yesterday creating all the double posts. I had to delete one of my own and figured out I could cancel the leave page and then refresh to see my post and that would keep it to one instead of two posts. Happens. We are on a shared host and when maintenance is being done, or other users on the same machine we are hosted on are hogging resources, we have this issue.

                        Edit: Still having issues. Host may be dealing with a DDOS mitigation. Lots of that been happening across the net lately.

                        Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                        rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
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                        ... and it should all work like magic and unicorns and stuff.
                        Originally posted by dmccaig
                        Overhead, some poor bastards are flying in airplanes.

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