Originally Posted by tubeman

Just to followup, the problem was resolved.

The car was very low on refrigerant. Once that was replenished, the A/C and aux fan still wasn't working. Then was figured out that the fan wasn't getting any signal/electricity. Cleaning the sensor contacts and the fan's power cord connector fixed that. Will have to monitor if vibrations disconnects any electrical signals to the fan.

Now the blower works in very hot exterior temps at any setting.