Re: 1937 Six radiator fluid

Posted by JWL On 2019/10/30 11:41:22

I had three Packards when living in Austin, Texas: 115C, 2122 and 5542. The winter temps would infrequently get to 32F or a bit lower. The summer temps were another matter, frequently getting to 100F and above. I used a 25% mixture of permanent type (green) antifreeze and de-ionized water in the cooling systems. This mixture was enough to protect from winter cold, and it also gave me good summer cooling since water is a better transfer of heat than antifreeze. I could have run water only with an anti-rust inhibitor in the summer, but chose to use a year-long coolant. A 50-50 mixture will protect way down to -34F, way below what you will see in Florida. My 2 cents...