My Dodge has the famous recirculation door failure blocking the fan and preventing air flow inside the cab even with fan on high it barely blows air out the vents. To replace a new part means dropping the entire dash so screw that. Work around fix:
On the passenger side up under the dash the fan motor is mounted with 3 screws and easy to get to. Unplug the electrical connector to the fan. Use either a flathead or a torx to remove the 3 screws and lower the fan. Reach up inside the hole and fish out the broke off recirculation door. It will come out without removing anything else. Now replace the fan and hook it back up. Now pop the hood. On the passenger side remove the 1 cowl screw located next to the hinge and up by the windshield. Remove the 3 plastic push in hold downs for the cowl. Pry up the plastic cowl and you'll see a hole there that is the inlet to the recirculation door (about 4 inches long and 1 1/2 inches wide). Cover the hole with duct tape or flex tape. Now put it all back together and you are done. Truck is now in constant recirculation mode and will blow your hair back.
Good luck and it works great!
On the passenger side up under the dash the fan motor is mounted with 3 screws and easy to get to. Unplug the electrical connector to the fan. Use either a flathead or a torx to remove the 3 screws and lower the fan. Reach up inside the hole and fish out the broke off recirculation door. It will come out without removing anything else. Now replace the fan and hook it back up. Now pop the hood. On the passenger side remove the 1 cowl screw located next to the hinge and up by the windshield. Remove the 3 plastic push in hold downs for the cowl. Pry up the plastic cowl and you'll see a hole there that is the inlet to the recirculation door (about 4 inches long and 1 1/2 inches wide). Cover the hole with duct tape or flex tape. Now put it all back together and you are done. Truck is now in constant recirculation mode and will blow your hair back.
Good luck and it works great!