Wondering if anyone has a procedure to drain and more interested in the refill and air bleeding of coolant for a 2005 Pacifica with a 3.5L. Seems the service manual is very vague. Without a radiator cap on the radiator do you open the top petcock to bleed air while refilling at the overflow tank? Do the petcocks typically open or are they usually stuck. Which way and how much do they actually turn? If someone has the steps that would be appreciated. Don't want to trap air and possibly overheat the engine.