RepairPal Certified shops can diagnose and repair your 2004 Chrysler Pacifica. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Are any of the lights or buttons on the climate controls non responsive or acting funky. If so, it likely needs the climate control unit in the dash. If not, it could be the motor that moves the mode door in the heater box.