Antifreeze

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   This may be a dumb question but can antifreeze settle out? I have an old nat gas powered pumping unit that has been sitting in the barn for the last 4 years. Before I parked it I changed the oil and antifreeze and then ran it for a few, maybe 10, minutes. I pulled it out a couple weeks ago and the antifreeze in the rad was slushy close to solid actually. I opened the drain on the block and it was fine. Put it in the heated shop and let it thaw out and took a closer look at it today. Antifreeze from the top of the radiator tested good to -8 celsius and the first stuff out of the block was good to -40. I mixed it all back up and it tested good to -29 which is about what it would have been when I put it in. How is that possible?

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Acguywill Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 15 Jan 2024 Location: Vauxhall ab Can Points: 185	Post Options Post Reply Quote Acguywill Report Post Thanks(0) Quote Reply Topic: Antifreeze Posted: 11 hours 15 minutes ago at 11:36pm
	This may be a dumb question but can antifreeze settle out? I have an old nat gas powered pumping unit that has been sitting in the barn for the last 4 years. Before I parked it I changed the oil and antifreeze and then ran it for a few, maybe 10, minutes. I pulled it out a couple weeks ago and the antifreeze in the rad was slushy close to solid actually. I opened the drain on the block and it was fine. Put it in the heated shop and let it thaw out and took a closer look at it today. Antifreeze from the top of the radiator tested good to -8 celsius and the first stuff out of the block was good to -40. I mixed it all back up and it tested good to -29 which is about what it would have been when I put it in. How is that possible?

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IBWD MIke Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Apr 2012 Location: Newton Ia. Points: 4235	Post Options Post Reply Quote IBWD MIke Report Post Thanks(0) Quote Reply Posted: 4 hours 31 minutes ago at 6:20am
	Never heard of that, never given it much thought. I suppose it's possible? It may not have mixed completely in the short run-time?

Jim.ME Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 19 Nov 2016 Location: Maine Points: 970	Post Options Post Reply Quote Jim.ME Report Post Thanks(0) Quote Reply Posted: 4 hours 23 minutes ago at 6:28am
	That initial 10-minute run time was not enough to thoroughly mix it. You should have run it up to temperature so the thermostat opened and kept it there for at least 10-minutes to circulate and mix the entire system.

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 22552	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 3 hours 9 minutes ago at 7:42am
	Especially if you dumped in a gallon of straight antifreeze and then a gallon of water and then didn't allow it to reach operating temps (open thermostat).

Codger Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 23 Dec 2020 Location: Utopia Points: 2556	Post Options Post Reply Quote Codger Report Post Thanks(0) Quote Reply Posted: 2 hours 58 minutes ago at 7:53am
	I always premix 50/50 in a five gallon bucket coolant to distilled water ratio with ethylene glycol. Have never seen it separate in the past. Typically I use "Prestone" for automotive use and "Fleet Guard" in low silicate formulation for industrial and truck engines.
	That's All Folks!

Acguywill Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 15 Jan 2024 Location: Vauxhall ab Can Points: 185	Post Options Post Reply Quote Acguywill Report Post Thanks(0) Quote Reply Posted: 48 minutes ago at 10:03am
	I always premix my antifreeze as well but just use tap water. Now a bit more information. I bought and mixed up a 10 litre jug of concentrated green antifreeze (actually 9.46l) a bit under 50/50 to give me about a -30c rating and topped it up with another 6 or so litres of the red stuff. All compatible. Now the stuff that came out of the block was nice and green but the stuff in the rad was the funny greenish reddish brown cloudy color. No actual rust or other gunk in any of it. I can't say I ve had an issue before but maybe the different types were not as compatible as the instructions indicated? But that wouldn't explain why the concentration varied from top to bottom.

DMiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 14 Sep 2009 Location: Hermann, Mo Points: 35255	Post Options Post Reply Quote DMiller Report Post Thanks(0) Quote Reply Posted: 40 minutes ago at 10:11am
	As noted 50/50 mix drain and refill after full flush and then run to operating temp and Confirmed flow. Should not ever Settle or Separate. Are currently Four types out these days, Old Green, Orange GM, Orange Ford, Red Hi Nitrate HD Diesel.