Does anyone know how to bleed cooling system and heater core on 2001 Cadillac De

the air should bleed itself out if thats your noise. drive car and continue to ck water level, keep heater on while driving

i agree with the 1st answer, keep a very close eye on the fluid levels and your temp gauge, if it keeps overheating the headgaskets are bad, they are notorious for it- very expensive and difficult to do. I have done several of them.....