murmanone Report post Posted October 6, 2013 Hi, I have a 1995 Cummins C8.3 engine in a Safari RV that I am changing out the coolant. I am concerned that I might not get all the air out of the block. I can't find and petcocks or removable plugs to vent out. I did find drain at bottom of oil cooler. Can anone help me out. Thanks, murmanone Share this post Link to post Share on other sites
wolfe10 Report post Posted October 6, 2013 See if there is a hose (small diameter) from thermostat housing to coolant overflow tank. If so, that will bleed the air from the system as you slowly fill the system. If not, the thermostat housing is where you will need to loosen a line, hose, etc to bleed the air, since it is the highest point on the engine. Brett Share this post Link to post Share on other sites
murmanone Report post Posted July 15, 2014 Thanks for the info. The air purging was accomplished through the small hose to the overflow tank. Share this post Link to post Share on other sites
