Not very specific on the question. I can go with my experience, though.
My 2000 T&C would turn off my headlights as I was driving. No special warning, and it did it randomly. Even when I had the fog lights on, it turned off my headlights. A new headlight switch fixed it right up! Make sure you get the right switch! The non-fog light switch and the switch with fog lights have very different electrical connectors!
The most reliable way to troubleshoot your 1999 Chrysler Town and Country fan is with a diagnostic tester. Most Chrysler dealerships use diagnostic testers.
A 2000 Chrysler Town and Country does not have a mass airflow sensor.
Lights, locks, parts of the AC system, gauges, alarm, wipers, ...........
A 2000 Chrysler Town and Country does not have a cabin filter.
A 2000 Town and Country does not have a cabin filter.
A 2000 Chrysler Town and Country can use 5W30 or 10W30.
A 2000 Chrysler Town and Country does not have a keyless code.
A 2000 Chrysler Town and Country uses R134a.
A 2000 Chrysler Town and Country does not have a cabin filter.
Total transmission capacity is almost nine quarts on a 2000 Chrysler Town and Country.
Start the van and see if the lights turn on automatically.
All the lights a flashing on the instrument panel on my Chrysler town and country minivan. Why?