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When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
Switch? Relay?
Air leak.
Trouble code P0401 means: Exhaust Gas Recirculation Malfunction
The Ignition Coil is the one that cause misfire or Spark Plugs
Bring to a shop that has an ABS scanner to determine the problem
On a 2003 Lincoln Navigator : A problem has been detected with the Anti-lock Brake System It could be a fuse , a sensor , or some other problem As long as the red " BRAKE " light is not on in your dash , you still have " normal " brakes
i"m not sure if a Lincoln navigator would have a sway bar, But my sway bar broke in my Chevy celebrity once and the whole car would rock side to side after turns and such. it's a bar by the rear axle and mine literally broke in two.
A problem has been detected with the Supplemental Restraint System ( air bags for front passenger and driver ) Take it to a professional
waves
by air blowing into them
A short.