The fan switch is probably half melted inside. When the fan doesn't make contact the A/C will not function. Keeps you from freezing up the evaporator. Mine melted 3 years ago. I changed the other just so it wouldn't happen to it. Costs 12 bucks and takes 15 minutes to swap. Most of the time is spent figuring out how to remove the plastic bezels without breaking them.
If the resistor pack (inside the vent duct) burned up you will nose it!
