2000 GrandCherokee Ltd-passenger heater problem

Hello! The passenger side heater is blowing cold air. The drivers side is okay.Is anyone familiar with this problem?

Hello! The passenger side heater is blowing cold air. The drivers side is okay.Is anyone familiar with this problem?
There is a problem with the blend doors!I sent my last customer to a dealership.in all data they show there is a factory problem with these warranty should really take care of this as it did with my customer.Dont let them charge you for this repair!