Well I have some new temp updates.
Last night before I hit bed, when the dogs and I went outside for our group "pack" pee in the yard at 2:30AM it was -14F out.
This morning by the time I was up and out in the shop by 7:45 it was -5F and the antifreeze poured out of the jug and into the cap great. It was MAYBE a TINY bit thicker than normal, like warm maple syrup.
I don't see any colder nights in the week or so out forecast, but I will update if we get another -20F or -30F cold snap.

I would think since I didn't totally flush my system out of the old antifreeze mix in Poncho, the tiny bit of extra water left over in the heater core, ETC, will get me even colder than the %100 in that jug.

 

Thanks Oliver, I think that that puts this debate to rest. I don't think that the science is wrong, just that the terms used are misunderstood. May I just say: Woo Hoo ...Mark

 

I wish this discussion was brought up again a few weeks ago when it was in the negatives for a solid week. Curious as to how long it takes to freeze based on the air temp.

 

Me too ...Mark

 

Well it was about a high of 0F here yesterday around lunch and dropped from there.
By 4 Pm it was -5F and dropping quickly.
That means it was sitting in between -5 down to -14F out for 15 Hrs.
I figure a half gallon jug sitting outside in those temps. gets cool pretty quickly in a plastic jug.
I know the case of beer started to freeze up in less than two hours sitting outside the shop as I was working on Dodges last night with my buddy Walter.

Yes if it was a couple of weeks ago I could have tested it down to -34F.

 

Before all you "scientific" types get all excited about your experiment proving that ethylene glycol doesn't freeze at 8°, consider that there's a little water in "pure" antifreeze to prevent that.

 

The mounts on both Mishimoto radiators I bought were a little high. I put the first one in and clamped it down. It cracked in about a year. the second one I shimmed.

That mis-alignment is a bit much, however.

 

Probably there is a little water in it because it's darned hard to keep it out since it sucks moisture out of the air. But then the bottle DOES say "Concentrate" which isn't quite the same as pure.

 

I am not trying to get too "scientific". It is actually a very simple test.
I am testing the EXACT stuff I filled my radiator with to make sure it is safe to park my rig out in the pole barn for a few nights in the winter if I need the shop space. Personally I would rather test it in a plastic jug than in my radiator / engine block.

It is a good question. How pure is pure?..but that is not what I am trying to solve. That would be scientific.
I am testing the stuff I am using, Napa house brand "pure" un diluted antifreeze.

I am just sharing what I see with my own eyes, which is often more important to me that what I read other people may, or may not have, have seen.

Do what you want with the info. I share.

 

Maybe you should read all of the posts. I said that a few posts before you, I don't mind being quoted though, even without quotation marks...Mark Edit: As Oliver said, nobody was trying to prove that EG, wait, I also said that before you did, never mind...Here you go so you don't have to look for it:

I want to point out to anyone that wants to bring up wind chill as a factor, antifreeze does not feel wind chill, only ambient temperature. It is only animals, like us, that feel colder with the wind. 0 degrees Fahrenheit is 17.7 Centigrade and is very cold. It is well below the 10 degrees Fahrenheit that is the accepted and reported temperature of the freeze point of ethylene glycol , not "antifreeze". I am really beginning to think that the small amount of water, that is apparently added to the EG, may well be the difference. Now for the conspiracy theory, they want your cooling components to corrode out, fail and have to be replaced. It is collusion between the auto makers and the antifreeze guys. Shame on those guys. I want to be the guy that brings down the great antifreeze conspiracy.

 

The passenger sided is way high at 2" from the top while the driver side is 2.5" from the top.

 

 

Good idea on the hydrometer, the prevailing wisdom is 2-3 percent...Mark

 

I had the same issue with mine and went through the whole warranty process with Mishimoto for a replacement. I had been running it for a few years but it wasn't until early 2017 that I discovered the problem while assembling the front-end of my truck after installing the freshly rebuilt (twice) engine. The radiator core had a definite crown in it from both tanks being pulled down. Upon further inspection, both mounts looked to sit about 1/2" too high. I'm truly surprised a leak never developed because I hammered those bolts home when I first installed the radiator. Neither tank cracked and no tubes split or pulled out of the headers through the years.

So, Mishimoto wanted measurements. I supplied them along with a few additional measurements. Compared to their drawings, the mounts were incorrectly positioned. This prompted me to ask the rep, "Are your radiators not assembled in jigs and are the jigs not being checked often to ensure each final product matches your design drawings? How did your quality control overlook this discrepancy?" The response was, of course, "Yes, they are assembled in jigs but I don't know how they deviated so much and how quality control didn't catch this error." They accepted my claim and sent me a replacement but not before I paid $150 to ship it. Odd that such an item would cost so much to ship but better than not having a lifetime warranty and having to pay full price.

In the end, I sent the replacement back. Its mounts were correctly positioned and I was happy right up until I found that the filler neck they welded on was significantly smaller than the factory size and wouldn't accept the lever-vent cap that I prefer to use and that I had been using on the original Mishimoto . I couldn't help but laugh at the BS but mostly, I was a bit steamed having gone through the lengthy process just to find another flaw in their craftsmanship. I called the rep immediately and told him I was going to send the replacement back and for them to send me a return shipping label as I wasn't gonna pay to send it back.

My fix... I flipped the hold-down brackets upside-down and put a 3/8" piece of aluminum flat stock between the bolts and the core support and brackets to keep them from deforming which they did when I first tightened the bolts. Luckily, this doesn't look ugly and I can live with it if I don't end up making my own brackets to compensate for the discrepancy.

That's my story and I'm stickin' to it! I feel out of breath just reading all of that!