I have a weird problem with a 92 Caprice. I am getting low air volume from
ALL vent positions (ac/max/heat etc). The temp lever works fine.
I am also getting frosting on the A/C evaporator which indicates to me
that I am not getting airflow on the evaporator itself.
The blower motor is fine and is blowing a mile a minute.
I had the the Air box apart (no easy chore!) and it seems like the
evaporator is clean.
For the life of me I can't figure out what is wrong but I am guessing that
the "main door" is somehow blocking the flow of air from the motor to the
rest of the system because like I said, I get low output from all outlets
depending upon where the lever is set.
Anybody have any ideas?
I would hate to have to remove the blower box again because like I said it
is a royal PITA.
I was thinking of maybe flushing out the box by squirting water into the
drain hole and then backing the car up on ramps to let it drain out.
I have the FSM but it is not really helpful for this.
All vacc hoses appear to be connected and I don't hear any leaking but I
suspect whatever the first door/object the air passes through on it's way
from the blower to the various vents is not open all the way.