According to my 68 Olds CSM, a SB w/ A/C holds 15.5 quarts. I assume Chevy is about the same. If you know the total capacity of the system, then you also know that if you add half that amount of coolant and the rest water, you have a 50/50 mixture.
The problem with draining the system, pre-mixing the coolant, and then filling it with the 50/50 mix is that it's not that easy to fully drain the engine. There's also a better chance of getting contaminants into the mixture. I agree that with the 3/4 of a quart that's left over you should add water to it, mark the container, and save it for topping off. Either way it's not the end of the world if you don't have an exact 50/50 mix but I think you'd get closer if you just put the right amount of coolant in and top off with water (assuming that the system started out with straight water). John Nasta -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Mike Holleman Sent: Wednesday, November 02, 2005 5:18 PM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] orange vs. green anti-freeze John, The best way to mix your antifreeze is use a clean drain pan, five gallon bucket etc. dump in two gallons of AntiFreeze and two gallons of distilled water, mix it up. Then pour through a funnel into the radiator. I use a funnel with screen just to be safe. If you have leftover, mark one of your now empty jugs as premixed and use this to add later. Your Elky will hold most of four gallons if it is completely drained. Mike
