Hi - I have a 99 Ford Expedition. A couple issues: The heat stopped working. The A/C & vent work in the Floor/Defrost position only - nothing comes out the vents. The rear works fine...the heat works once the car warms up. Any suggestions???

 

Sounds like you may have a problem in the vaccum supply to the A/C controls. The system defaults to the defroster position if there is a loss of vacuum to the controls. The slow heating may be a thermostat problem.