I agree with the recommendation to exclude air from our cooling systems. Perhaps the new corrosion inhibitor packages have oxygen scavengers that can only gobble up a small amount of O2 and will poop out if fresh air is ingested each time the engine heats up and cools. Below is information on a 7# radiator cap that is supposed to work on '51-'56 Chryslers with overflow bottles. I'm trying to find one and may have to modify the overflow tube on the radiator of our '55 C-300 in order to route it to a milk jug or somesuch. Although, I don't see any problem with tying a rubber tube onto the bottom end of the existing overflow tube and routing it to the "milk jug". Anyone successfully done this on a '55-'56? More demerits. We enjoyed the Chrysler 300 Club, Inc. meet held last week in Tacoma. Minimal precipitation early morning before the show, then dry all day. Forward Looking to Branson. Hoping no members are suffering from the horrible wildfires in this state. We drove through two smoky areas on I-5 on the way home from Tacoma. C-300'ly, Rich Barber Brentwood, CA 1955 Chrysler C-300 NORS Radiator Cap Edelmann Part No. ER-23 - 7lb. - used with Coolant Recovery Tank Buick - 1948 1949 1950 1951 1952- All Buick - 1953 1954 1955 1956 - without Air Conditioning Chevrolet - 1954 1955 1956 1957 - All - (except Corvette) Corvette - 1956 1957 Corvette - 1958 1959 1960 1961 - without Fuel Injection Chevrolet Truck - 1955 (2nd Series) 1956 1957 1958 1959 1960 1961 1962 - 6 & 8 Cylinder - All Chrysler - 1951 - 8 cylinder Chrysler - 1952 1953 1954 1955 1956 - without Air Conditioning De Soto - 1952 1953 1954 1955 1956 - without A.C. Dodge - 1952 thru 1956 - without Air Conditioning Ford - 1952 1953 1954 - 6 cylinder - All Ford - Late 1953 thru 1954 - V8 Imperial - 1955 1956 - without A.C. Lincoln - 1949 1950 1951 Oldsmobile - 1949 thru 1956 - All Plymouth - 1951 1952 1953 1954 - All Plymouth - 1955 1956 - without A.C. Pontiac - 1951 thru 1956 - All -----Original Message----- From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Paul Holmgren Sent: Tuesday, September 01, 2009 3:16 PM To: Chrysler300@xxxxxxxxxxxxxxx Subject: [Chrysler300] living with modern anti-freeze products Ok, after this subject has been beat to death several times, and after a lot of reading, both reports, and manufacturing claims, and taking into account direct experiences, I think I have figured out the main thing we need to so for our vintage cars surviving this sort of modern automotive chemistry. OVERFLOW tanks, of any sort that allows an overflow radiator cap AND fluid maintained in the tank. THE reason seems to be that NO air is to be in the cooling system at all. I think all current formulations being sold today are of this nature. The only way to do this is to purge as much air out of the cooling system and to maintain the same mix in the overflow tank. As the final bit of air gets purged by the normal operation of the system then the fluid that is used will not break down as fast in the cooling system. The particulates that settle out and develop the crud that blocks the heater core and other small passages then does not happen (normally), sometimes as fast as 6 - 12 months. This short time span breakdown I have personally seen and experienced in systems comparable to the 55 - 65 cooling system designs. I think the first signs of the breakdown can be seen in the overflow tanks as a film of buildup of the particulates as they settle out of the fluids exposed to air in the overflow tank. All one should have to do for the 2 or so years between changes is to make sure that the overflow container never runs dry during the periods that you operate your car. I personally will still adhere to the 2 year change out cycle, regardless of the vintage automobile. We have seen the desirability of doing this even with modern cars. AND above all else, Do Not Mix Types of coolant in the same system. -- Paul Holmgren Hers: http://in09.endcancer.org/goto/Cindy.Holmgren ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! 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