Wasnít sure if this should go in the HVAC section or not, since it has to do with the factory air I put it here. Just started on a long road trip today in a Ford E450 shuttle that Iíve been renovating. On the road 2 hours and my air in front dash went out. Fan blows for a second and then gets weaker and weaker. Vent feels cold, but no fan. If I let it set for a while it will do the same thing- blow for a minute or so but getting weak quickly. Any ideas??