Originally Posted By: Bill in Utah
Originally Posted By: benjamming
Bill,
It's no different than doing a drain & refill on the AT. However, you may not do that either I don't know.
How are you hoping for a 50% final mix when using a 50% mix? I don't get it. I start with 50% mix in system. I drain 50% of capacity. I fill with 50% mix. How can I not be left with 50% mix?
You will not have 100%
Fresh/new coolant in your system.
If you drain and flush with distilled water to a point that you have fresh distilled water in the system, drain it and add 50% of the capacity with Straight fresh coolant and top off with distilled water then you'll have a fresh 50/50 mix of coolant and water.
With 50/50 mix, you'll never get all of the old stuff unless you flush with the mix.
Its my belief that with a coolant system, you'd want to get all the old coolant out.
I may be wrong, but I've never had a cooling problem in the many decades I've been owning and operating vehicles.
I've only owned 3 automatic vehicles in the last 30+ years. With every one but the current Subaru, I would disconnect the cooler line and flush all the old fluid every 60k.
The Subaru I'm just doing drain and fills but understand that I'm not trying for a percentage number. I'm just draining some of the old fluid out and getting fresh fluid/additives back in the system.
With Cooling systems (and esp with todays small systems) you need to get the old stuff out and a certain percentage mix in for protection.
If you are not caring about how much fresh coolant is going in the system, then 50/50 will work.
And I'm not even addressing the RIP OFF cost of 50/50 mix which I have a problem of.
Hopefully this makes some sense. I'm operating on very little sleep this week... (about 10 hours total for the week)
Take care, bill
I never claimed that you will have fresh/new coolant 100%. I was merely addressing
Originally Posted By: Bill in Utah
You are guessing and hoping for a 50/50 level with 50/50 mix.
So what threw this sidebar discussion off was that you were only discussing completely replacing the coolant.
I certainly do agree, of course, that buying premix is paying a lot for purified water.