I have done a lot of dodge A/C repair ( seems dodge A/C systems aren't as reliable as fords IMO) and ive seen every single component go out. my 3rd gen has probably had 4 complete new ac systems piece by piece
So if your fan clutch went out while at freeway speeds, lets say 50 mph or over you shouldn't notice it until you stop for a light or traffic. With the vehicle off, if your blower motor responds to each fan speed on the HVAC controls its not the resistor next to the blower motor.
A temp gun and gauges will be your friend here. BUT another thing you can do really quick is drop the 3 screws holding the blower motor in and take a look / feel at the evap coils in the air box.
Down here in texas the humidity is constantly high,
I was stuck on a job in midland and mine kept freezing up after an hour of driving. freon looked fine but i replaced the liquid line anyways.... same ****.... I finally dropped the blower motor and looked at the coils and BAM.... Algae was covering more than half of the surface area. I ended up covering my carpet with trash bags and soaking it down with foam cleaner and rinsing it with a water hose. lord knows how long it was partially clogged because its been exponentially better since then.
And if your in there you can look directly at one of the blend doors. looking up that blend door is re-circulation / max a/c or outside air. If you live in the south or anywhere with high humidity i recommend ALWAYS running MAX A/C.
that blend door actuator on my 07 broke in probably 09. i cut a stick to length and wedged it on there so that it would only recirculate less humid air from inside the cab and i never looked back!
(sorry for the novel, coffee just kicked in!)