2001 Cadillac Deville. i hear water sloushing behind dash. i had temp prob and

What is your question?

i had a waterpump, thermostat, and radiator cap. it still ran hot . We had hard time getting air out and enough coolant in so as not run hot. i am still hearing water sloushing behind dash. what do i need to do now? also how do you install actuator door, not getting air or heat from center dash vents.