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Tool Talk Discussion Forum

SA 200 antifreeze

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03-13-2018 22:22:23

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tonight I changed oil in my welder, and as it's been a few years ,decided to change the antifreeze as well. opened radiator drain, and the antifreeze looked, and smelt like new. but I didn't drain as much as I thought I should. I opened the petcock on the engine. nothing cam out. put a little air to the petcock, and the worst looking brown antifreeze came out of the engine. tomorrow i'll pull the thermostat and flush the system. anyway, the antifreeze looks like it came from 2 different machines. i'm confused as to why the anti freeze wasn't all green, or all rusty looking. why didn't it mix. the welder has a temp gauge on it, and doesn't overheat. even if the thermostat was stuck shut, the bypass hose should of allowed enough coolant through to the radiator. that should of mixed it. I can't believe what I saw tonight. can anyone explain it to me? thanks for your help

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03-14-2018 19:10:58

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 Re: SA 200 antifreeze in reply to mjsnodgrass, 03-13-2018 22:22:23  
This is also a good example of checking or changing antifreeze, just because it looks ok, clean or good color doesn't mean it is still good.

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03-14-2018 12:09:51

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 Re: SA 200 antifreeze in reply to mjsnodgrass, 03-13-2018 22:22:23  
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Actually there are now long life antifreeze mixtures available... With better additives to fight acid buildup, now it lets the antifreeze work longer. Many oem antifreese's mixtures are considered lifetime. Keeping the acids in check, the rust inhibitors, and other additives can continue on in use. The first long life was an OAT.. then came MOAT.... (modified organic acid treatment) that became the so called lifetime antifreeze. With coolant reservoirs keeping the system completely full and storing excess in the reservoirs, there is limited oxygen for rust and deterioration of the additives.

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03-14-2018 05:05:29

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 Re: SA 200 antifreeze in reply to mjsnodgrass, 03-13-2018 22:22:23  
Very common, sediment has settled in the bottom of the block water jacket.

Just flush it, it will be fine.

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Stephen Newell

03-14-2018 04:21:15

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 Re: SA 200 antifreeze in reply to mjsnodgrass, 03-13-2018 22:22:23  
It probably would have mixed if you had changed it after running the welder for a while. In any case they put a anti-rust additive in antifreeze which wears out and lets the engine rust. From what I understand the additive in the newer antifreeze wears out faster than what it used to so you probably should change the fluid annually.

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03-13-2018 22:49:56

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 Re: SA 200 antifreeze in reply to mjsnodgrass, 03-13-2018 22:22:23  
All the dirt and sediments settle to the bottom, the brown gunk was probably fairly settled until you shot air in there and broke it up and it came out looking real bad. There is not a lot of turbulent coolant flow at the bottom of the block, that is usually where most of the sediments settle and stay.

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03-13-2018 22:51:56

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 Re: SA 200 antifreeze in reply to 4play, 03-13-2018 22:49:56  
that makes sense. thank you

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