Passenger side blows cold air, driver side warm air

Hello, sounds like you may have a dual zone climate control system - where you can adjust drivers and passenger side independently of each other. If this is the case -- when one side will not adjust to the proper temperature, there is either a problem with the control mechanism, the motor that turns the doors behind the dash inside the ventilation system plenum which meters the temperature from hot to cold, or a problem with the actual doors or plenum. Testing will need to be performed to find out what has failed and how it can be repaired. Alternatively, there could be an issue with system charge -- if there isn't enough refrigerant due to a leak -- it could be difficult to get cold air all the way across the dash from the evaporator core which is lacking in coldness. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops