a few of the dual zone HVAC systems have a 5th actuator, that one is against the firewall, the Ram Vans have 5 actuators
I don't know which of the Ram pickups could have them.
In your case, pull both glove compartments
Then look up, the 4th actuator moves the Recirculation Door
while you have the glove compartments out
check your Cabin Air Filter
it keeps your A/C condenser cleaner
I am just thinking,
If your actuators all work , i would change the CAF out, with a another one
many owners buy the CAF from Geno's Garage
or
Fram Fresh Breeze Cabin Air Filter with Arm & Hammer Baking Soda,
others prefer a CAF with charcoal or carbon
the CAF is fairly easy to change out, finding the door clips, takes bit of finger work
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