Re: antifreeze freezing

Posted by redforlife on November 03, 2021 at 08:03:34 from (68.234.121.189):

In Reply to: Re: antifreeze freezing posted by Russ from MN on November 03, 2021 at 06:21:27:

Well, it will mix within the system if you do things right. You just didn't do things right. It sounds as if you topped it off with straight antifreeze without any water. If the rest of the system was already 50/50 blended, its hard to tell how strong your blend ended up being after topping off with straight antifreeze. 80/20 perhaps, just guessing. This vary conversation is about straight antifreeze getting slushy in freezing temperatures.
When I worked in a mechanic shop, flushing the system was always done in conjunction with a coolant change. This was done by filling system with water and then draining several times. And then stick garden hose in radiator neck, with the drain open. Start engine and let run untill thermo opened a couple times, with hose and drain flowing water the entire time. Then shut engine off, shut water off, let it drain completely out the radiator drain, and then shut that off. Looked it up in the books to see what the system held. Added half that amount of straight antifreeze to the system and top off with water. Usually not much water was needed, since we didn't drain the straight water out of block. We avoided having to do this by knowing what the system held.
As a safety measure, we would let engine run untill thermostat opened 2 or 3 times. We did this to get air out of system. We would add water as air worked its way to top of radiator. You could tell if thermo was open by feeling how hot the top radiator hose was. Lastly, we would test for antifreeze strength. Never ever had a problem. We only checked for strength to ensure somebody didn't install a larger radiator or engine or something which would make book capacity not right.
Would of worked for you if you wouldn't of added straight antifreeze to the system and allowed it to run until the thermostat opened before taking it outside in 30 below zero temperatures. An engine has to run a long long time to open the thermostat when it is that cold.

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