90eliminator Posted September 20, 2010 Share Posted September 20, 2010 I am going to upgrade my cooling system to the open system, but should I flush the system before I do the switch, or just wait and do it after....opinions? Thanks Link to comment Share on other sites More sharing options...
Comanche County Posted September 20, 2010 Share Posted September 20, 2010 Umm, I think "after" but with a hose, It probably doesn't matter. Just need to ensure its flowing clean because you don't want gunk in the engines cooling passages to block up the new rad, then fill it up with antifreeze mixture. Link to comment Share on other sites More sharing options...
Eagle Posted September 21, 2010 Share Posted September 21, 2010 Before, or during. The LAST thing you want to do is flush all the crappola from the block into a new radiator. Link to comment Share on other sites More sharing options...
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