The doors are moved by vacuum. You need ot trace the vacuum line that goes into the firewall on the pass side to make sure it is not broken.
No
One reasons a Dodge W 250 defroster may not work is the blower motor relay. This can be replaced easily. If it isn't the relay, there may be a problem in defroster door binding. A mechanic will be able to determine the cause.
no
Find the vacuumline that goes from the intake to the resirvoir and from the resirvoir to the inside of the cab. It isn't connected.
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No
rear window defroster light keeps flashing
The vacuum line that goes to the defroster is probably disconnected, possibly on the fire wall.
with a key