Two problems related to cruise control have been reported for the 2003 Lincoln Navigator. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Lincoln Navigator based on all problems reported for the 2003 Navigator.
Loss of brake fluid, leaked through to cruise deactivation switch into cruise systems and electrical components causing corrosion which caused a short. Had trouble with cruise control working over time lead to higher flow of current that overheated and caused fire at switch under hood. Ford speed control deactivation switch fire. The fire originated in the area where the speed control deactivation switch is located (left rear corner of the engine compartment at the master cylinder. There was evidence of speed control deactivation switch failure prior to the fire including inoperable speed control, repeated difficulty shifting out of park.
Driving on interstate; cruise control set at 70 mph; engine revved to full speed and could not be disengaged by the off or by changing speed of cruise; braking would slow the vehicle temporarily; was only able to stop the vehicle by braking which did not stop the vehicle but slowed it somewhat and then I put the vehicle in neutral and turned off the ignition. Vehicle was not able to be driven until it was towed to a dealer and the cruise control was disconnected. It was a very frightening experience. Also smelled something burning after the vehicle was stopped. The vehicle was a 2003 Lincoln Navigator.