I just bought a 2004 Chrysler Pacifica as well. I bought it 2 weeks ago and heard noises the day after i bought it i took it to a shop today and i have the same problem with my PAC, the subframe is completely rusted out .The vehicle was garaged kept from 23, 000 miles up till now . I am the 2nd owner since 23, 000 miles. This PAC was purchased new in Delaware from the 1st owner and has been owned in the state since .
A rep at Chrysler admit to the a letter and now they have a revised letter to cover up their mistakes.
Type this into google search 0004617/#45543 / x26 . This is a letter from Chrysler stating they will replace [protected] Chrysler Pacifica subframes if they are from the salt belt states upto 10yrs 150, 000 miles and here is the link stating what states are salt belt states. http://townhall-talk.edmunds.com/direct/view/.f0ec024/598 .. read section #603 of 763.
http://pacificaworld.com/storage/04-05_Pacifica_Engine_Cradle_Letter.pdf
Look at all these complaints !http://www.automotix.net/autorepair/car_problems/chrysler-pacifica/2004/structureframe_and_members/
The complaint has been investigated and resolved to the customer’s satisfaction.
You should of looked at the frame before you bought the car. It's 9 years old for Gods sakes.