Ensure the vent for fresh air is set at recirculating. Check window glasses for proper sealing. Ensure the firewall grommets and wireharness holes are properly sealed.
The decreased air flow confirms the cooling coil is icing up.
If the thermosensor at cooling coil is not positioned correctly, the cooling coil would be iced up before the control unit is told to cut off. A faulty thermosensor would result in that also.
Did you try setting the temperature to a higher setting? I would never set my temperature at minimum when running for long distances.
Friday, September 7th, 2012 AT 8:28 AM