Electric Blueberry 0 Posted October 23, 2017 Share Posted October 23, 2017 Hello, I had a cracked reservoir and the replacement arrived today. I've more or less been adding only water the last couple of months. As the car has 105,000 miles, I plan to go ahead and drain all coolant and replace with fresh. Does the open petcock drain all the fluid out? (5 quarts I understand). Or is there block drain plug(s) to get all the fluid out of the block? I recall on my SBC's the petcock would only drain 50% (2 gallons). To get the remain 2 gallons out you'd have to remove 2 knock sensors that would drain an additional gallon each. Thanks! Joey Link to post Share on other sites
tfraser3 10 Posted October 23, 2017 Share Posted October 23, 2017 (edited) on my 2013 i just unscrewed the 2 ( or 3) bolts disconnected the hoses one at a time and quickly reconnected it to the new overflow tank and lost minimal fluid. No need to drain radiator. Or at least for me . Edited October 23, 2017 by tfraser3 add two words Link to post Share on other sites
tfraser3 10 Posted October 23, 2017 Share Posted October 23, 2017 1 minute ago, tfraser3 said: on my 2013 i just unscrewed the 2 ( or 3) bolts disconnected the hoses one at a time and quickly reconnected it to the new overflow tank and lost minimal fluid. No need to drain radiator. Or at least for me . Unless your fluid is really bad and discolored its probably fine. especially if you have had a leak for a while. Link to post Share on other sites
Mr.tozzi 66 Posted October 24, 2017 Share Posted October 24, 2017 6 hours ago, tfraser3 said: Unless your fluid is really bad and discolored its probably fine. especially if you have had a leak for a while. Reading is good for ya... He said he has been filling up with water only... so the mixture in his cooling system is wrong now. He wants to drain all of it to make it right. Link to post Share on other sites
tfraser3 10 Posted October 24, 2017 Share Posted October 24, 2017 oh yes water is a big no no . Link to post Share on other sites
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