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Old 06-26-2019, 07:08 PM   #13
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Join Date: May 2010
Location: Oshkosh, Wi
Posts: 3,436
Default Re: 59AB Cooling System Advice Needed from the Experts (not an overheating issue)

I have a similar problem with my 39. I traveled to Back to the Fifties this past weekend, about a 300 mile trip one way. After arriving I had to add about 2 quarts of water. Mine is an open system with no pressure cap. Coming back, same story. My radiator is original and I was thinking that it probably can't candle the flow anymore. I was generally running around 23-2500 rpm. By the way, I averaged 18mpg. Also I run water with no anti-freeze.
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