Do you have separate heat/cooling controls for driver and passenger. If so, you have two blend doors/actuators.
SOURCE: cold air on passenger side warm air on drivers side
Actuator motors either get a tear in the rubber or a hose is broken and not letting vacuum assist in its opening.
You can try moving the lever by hand and see if the air gets colder on the bad side.
SOURCE: Air Blend Actuator not working
Make sure you are getting plenty of vacuum to the control, if you are than it will have to be replaced.
SOURCE: need to locate blend door actuator on 2002 ford
Open the glove box,and look on top of ac/heater box toward the center of vehicle,it should be setting right there.
SOURCE: What do I have to remove to access blend door actuator
very lenghty process. too long to describe here....go to Bonneville Forums read the text and follow linked there at the bottom....very good and detailed....I'm doing that right now,,,,it is a bugger,
SOURCE: The driver side only blows
Yes it is most likely a vacuum actuator there are more then one . They open and close little doors in the ducts to deriect air flow inside the ducts . They are not easy to get at in most cases however you should look at all vacuum lines going to and near the unit its controlled by engine vacuum . exhust all other opptions first before takeing the dash out . The problem could also be electrical check the control switches make sure the switch is not bad on one side . Spend some time looking and thinking before you start riping things apart. Good luck with it
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