JO BO Posted September 18, 2019 Share Posted September 18, 2019 (edited) Hi, I am in the process of draining and refreshing the coolant in a 1915 Cadillac center door sedan and was wondering if anyone out there knows the coolant capacity it would have? I plan on making the antifreeze mixture strong ...60-70%. Is this a good idea in your opinion? I live in an extremely cold climate and occasionally have power outages so don't want to take a chance at any freeze ups. Will taking the plugs from the bottom of the water pumps (2) of them totally drain the system? I appreciate any knowledge you would like to share. Thanks Jo Bo Edited September 18, 2019 by JO BO (see edit history) Link to comment Share on other sites More sharing options...
Michael J. Barnes Posted September 18, 2019 Share Posted September 18, 2019 Jo Bo: Check the owner’s manual or service manual. My 1924 Cad has a special screw at the base of the pumps that needs to be turned to a certain position. It has an arrow on it. That actuates a cam which raises the accordeon-style thermostats and permits complete drainage. It does not matter in my case as the thermostats are absent. And I can’t speak for your car: whether the pumps were configured that way. Link to comment Share on other sites More sharing options...
Michael J. Barnes Posted September 18, 2019 Share Posted September 18, 2019 By the way, I would still welcome you back in the EarlyV8Cadillac forum. The member who said unkind things was subsequently expelled from the group. Other members were very interested in your car, and you were kind enough to upload photos of it. Cheers, Mike Barnes, Vancouver Link to comment Share on other sites More sharing options...
JO BO Posted September 29, 2019 Author Share Posted September 29, 2019 Thanks, I found the answer I was looking for in an online article. 5.25 gallons is the coolant capacity if anyone else was searching. 1.5 gallons of oil for the crankcase Jo Bo Link to comment Share on other sites More sharing options...
72caddy Posted November 19, 2019 Share Posted November 19, 2019 If it were me, I would double check if the coolest is OK for brass radiators. Some of the new stuff can eat away at the metal. Empty may be a better option.... 1 Link to comment Share on other sites More sharing options...
JO BO Posted November 20, 2019 Author Share Posted November 20, 2019 thank you for the insight into possible coolant issues. I will take your advice and drain it dry for now. I think I would feel better that way. Thanks again Jo Bo Link to comment Share on other sites More sharing options...
JFranklin Posted November 20, 2019 Share Posted November 20, 2019 Before I drain a cooling system for long term storage I add to the existing coolant a cupful or so of soluble oil to coat everything before draining and keep rust at bay. Link to comment Share on other sites More sharing options...
JO BO Posted November 22, 2019 Author Share Posted November 22, 2019 Thank you the advice.....I really appreciate it as I hope to do the best thing possible. Jo Bo Link to comment Share on other sites More sharing options...
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