bad blend or mode damper door motor actuators. is cause (maybe)
we know how to move them by hand motors off (actuators)
hot all the time is blend unless AC compressor is dead.
yes blend doors can jam fully to hot, sure can.,
It needs service, there are other causes.
most of the tests you can not do. or easy.
there are 2 systems here.
- the blower distributor system. (dampers 3 or more0
- or
- the AC R134 loop dead or weak.
what I do is make sure the compressor runs
and if does,
move the blend door by hand (my jeep has built in self test of this)
and by hand I put the damper to evap core only mode and if no cold air now, the loop is bad and I stop here, lots more tests from hear.
or he AC condensate drain is clogged even covering up deeply evap core . blocking is air flow., and super common this and a simple fix.