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post #1 of 21 (permalink) Old 12-06-2018, 06:12 AM Thread Starter
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Freeze protection- HD Coolant

This is from the HD Service manual for 2018 Touring-

"GENUINE HARLEY-DAVIDSON EXTENDED LIFE
ANTIFREEZE AND COOLANT is pre-diluted and ready to use
full strength. It provides temperature protection to 34 °F
(1.1 °C). DO NOT add water."

Does that sound right? Only 34 degrees? Sometimes I will be out overnight, and its sometimes below 34 overnight at the hotel. I guess I need to change out the antifreeze....
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post #2 of 21 (permalink) Old 12-06-2018, 08:05 AM
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Straight water doesn't freeze till 32 degrees. So I think it's a typo -34 degrees. I would call Harley about it rather than the dealer.

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post #3 of 21 (permalink) Old 12-06-2018, 08:25 AM Thread Starter
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Straight water doesn't freeze till 32 degrees. So I think it's a typo -34 degrees. I would call Harley about it rather than the dealer.

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I thought that too, until it also says " 1.1 * Celsius." That would be a double mis-print.
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post #4 of 21 (permalink) Old 12-06-2018, 08:58 AM
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Quote:
Originally Posted by trainey View Post
This is from the HD Service manual for 2018 Touring-

"GENUINE HARLEY-DAVIDSON EXTENDED LIFE
ANTIFREEZE AND COOLANT is pre-diluted and ready to use
full strength. It provides temperature protection to 34 °F
(1.1 °C). DO NOT add water."

Does that sound right? Only 34 degrees? Sometimes I will be out overnight, and its sometimes below 34 overnight at the hotel. I guess I need to change out the antifreeze....
Should say -34 degrees F and boiling point is 269 degrees
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post #5 of 21 (permalink) Old 12-06-2018, 09:24 AM
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Yes it was a typo. If it was 34 degrees I would be screwed. Both the last 2016 and 2017 have been out in close to 0 degrees with no issues.


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post #6 of 21 (permalink) Old 12-06-2018, 09:48 AM Thread Starter
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Yes it is a typo, verified with HD. Thanks!
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post #7 of 21 (permalink) Old 12-06-2018, 12:00 PM
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I do not own a liquid cooled Harley, but, for 25 years I have used a 50/50 mix of distilled water and Prestone Extended Life (orange, silver jug) in everything I own that is liquid cooled on two and four wheels with absolutely zero issues. Way cheaper than HD/Honda/Kawasaki pre mix.

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post #8 of 21 (permalink) Old 12-06-2018, 12:07 PM
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Quote:
Originally Posted by trainey View Post
This is from the HD Service manual for 2018 Touring-

"GENUINE HARLEY-DAVIDSON EXTENDED LIFE
ANTIFREEZE AND COOLANT is pre-diluted and ready to use
full strength. It provides temperature protection to 34 °F
(1.1 °C). DO NOT add water."

Does that sound right? Only 34 degrees? Sometimes I will be out overnight, and its sometimes below 34 overnight at the hotel. I guess I need to change out the antifreeze....
Is that the Harley service manual, or the owners manual? And what page is it on, so I can correct it.

The 18 FL owners manual states -34f and -36.7c on page 151
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post #9 of 21 (permalink) Old 12-06-2018, 12:45 PM
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Originally Posted by jcarruth View Post
I do not own a liquid cooled Harley, but, for 25 years I have used a 50/50 mix of distilled water and Prestone Extended Life (orange, silver jug) in everything I own that is liquid cooled on two and four wheels with absolutely zero issues. Way cheaper than HD/Honda/Kawasaki pre mix.
The two types of automotive coolant in wide use are the blue/green/yellow Ethylene glycol and the pink/almost any color you want Propylene glycol.

Ethylene glycol brakes down into a bunch of acidic compounds. Acetic, oxalic, glycolic, and glyoxalic acid being the ones that do the damage. And they tend to attack rtv and sme plastics, making them unsuitable for use in newer vehicles. There is also much more electrolytic action between dissimilar metals. And it tends to cause salt crystals to form over time, these abrade the seals in pumps and valves, as well as precipitating out on the surfaces of the radiator and heater cores.

Propylene glycol addresses the incompatibility with plastics because it breaks down into lactic acid. But it will still corrode metal. At least it changes color as it becomes acidic. But being non toxic, it is subject to being colonizes by organics, the slime you sometimes find in unmaintained systems.

With Ethylene glycol, the mix can be run as high as 70/30 to get additional protection. But as the Ethylene glycol content of the mix goes up, so does the corrosiveness. So thinning the mix made things like heater cores and freeze plugs last longer. 40/60 protected to -10 and was about 25% less corrosive than the common 50/50 mix. Down south a qt to the gallon of water was fine for the occasional frost. Funny thing about it is that pure Ethylene glycol protects the same as a 30/70 mix, but when heated will eat cast iron. Back in the day, how many people did you see drain the radiator in the fall and then fill it up with straight antifreeze? Or add straight antifreeze to their leaking systems. Wonder what mix they ended up with?

Propylene glycol does not freeze protect as well as Ethylene glycol, so 50/50 is about the same as 40/60 on the old stuff. It is very subject to reacting with some impurities in tap water. Iron and calcium being the most common. They will shorten the life considerably. So it is usually sold pre mixed. And these days its designer coolant. Just like with brake fluid, each manufacturer will add supplements to address their particular needs (engineering mistakes?).
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post #10 of 21 (permalink) Old 12-06-2018, 02:05 PM
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Seriously good information. You sound like my doctor, when all I want to know is “will I live?”. So if you owned (yes, I do) a 2017 RGU, what coolant would you run in it? I live in KS and although it is unlikely to freeze in my garage, there is the chance that it will spend an overnight somewhere that the temps will be very cold through the night. I’m running the Harley brand to date.
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