Using Red coolant and flushing the Blue

Craig Dain Gary cgary at
Fri Feb 21 12:41:31 EST 2003

Here's a informative discussion about blue vs. red Pentosin coolant:


At 6:29 AM -0500 5/21/03, BriceW at wrote:
>I am getting ready to replace the whole cooling system. I have had all
>the parts for months  but have been lazy as my neck repair is still
>Got all new hoses, new Nissens metal radiator, new aux radiator, all new
>mounts for both, new expansion tank and cap, new temp and fan switches,
>thermostat, etc,
>I just don’t ever want to mess with the cooling system again.
>Its a 13 year old car.
>Anyway I was going to use the blue antifreeze again and properly mix it
>with distilled water which I hadn’t done before always using tap.
>I read on Scott’s invaluable site that the red coolant is superior but
>you need to do a thorough flush with distilled water.
>I was always that once blue always blue and never go red.
>So my question is, should I take it to the dealer or mechanic who has a
>professional pressure flushing machine and have a thorough flush done
>with distilled water and then fill the old system with only distilled
>water before I do my cooling system change and then switch to the red. I
>don’t think that I can do a proper flush with a garden hose. I have
>done it before but I am very leary about doing it this time if switching
>to red.
>What is the exact recommended mixture for the coolant? I have been just
>doing a 50/50? I live in Kansas so the temp never goes below -5° with
>wind chill.
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