Coolant, Ratio vs. Temperature

[Yamahammer485]

Hey all

Going to dilute my coolant in the attak soon, but my prestone brand coolant tester goes by temperatures, in that yor safe up to -37C for example.

My question is what does this mean in terms of ratio of water to coolant. As in, with a 60/40 mix, what temp. does that equate to on the guage?

Also, what should the untouched coolant already in the sled read on the meter?

Thanks for any help!

 

[apltx08]

Here are a few links, hope it helps...the second link seems to have a little more info about half way down you'll get the mixture ratio's


http://www.shamrockchicago.com/PrestonAfSpec.html

http://pages.prodigy.net/jforgione/MB_WW.html

 

[rxrider]

I don't know the answer to your question but I know that a 50/50 premixed coolant from a autoshop or gas station would be safe down to -36C or -32F.

 

[apltx08]

I drained 2 litres out of mine and added distilled water plus a rear cooler and never had a problem all winter, I even ran a road side a mild day for a few kms and no overheating nor light or fan come on...

 

[Yamahammer485]

Excellent info!!

Im going to check what the original coolant says, then most likely near 2L

Also, just so everyone knows, from following that chart, you get around -53C for a 60/40 mix (coolant to water)