2013 the a/c was fine?
SOURCE: Problem with AC, dual climate zones
The temperature blend door on the driver's side might be broken or stuck. Also, if this vehicle does not have the correct amount of refrigerant, it will do what you are describing.
SOURCE: Passenger side a/c blowing hot
There's a rod assembly that opens and closes the vents in the car
for the automatic climate control. It's supposed to open all vents to
the AC feed when in AC mode. BUT, if it slips loose, the default
status is to feed heat through (you can open a window in the summer,
but you don't want AC blowing in your face and on your windshield in
the winter). In my case, the driver's side was working right, pumping
cold air, but the passenger side was actually dumping hot air into the
car. Friend who fixed it for me told me he just had to
drop the glove box etc. on the passenger side to get to the rod and
slipped it back into place. I'm not agile enough, but if you are, you
can probably crawl around under there and figure it out - or get a
friendly mechanically inclined young friend to do it for you. Probably
in the mechanic's manual for the Caddy (I don't have one).
Think this will fix it for you - did for me.
SOURCE: Hot and Cold
The most likely cause of your problem is the blend doors under your dash. If they are not moving like they should it can cause this type of problem. You can look under the dash to see if there are any linkages that are disconnected. Some of these are very hard to change so you might want to take it to a repair shop unless you are very good with cars.
SOURCE: Cold AC but weak Airflow---Also Driver side not as cold as passenger
The air doors are controlled by actuators that on of them or so may need replacing.
SOURCE: Blows A/C out of Drivers Side, and Heat out of Passenger Side
It is the climate control under the passenger part of the dash. it is easy to fix any way it was for me on my 99 deville. Take the cover off and you should see the controller just about under the clove box it is about 3" X 3" has a rod connected to it and a electric connection on the top and 3 little screws holding it on. Just unscrew the screws and unplug the electric connection and unhook the rod.
Just ask for the climate control switch at the Cadillac Dealer the cost is about $160.
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