It's been warming up around here, and I found the A/C in the xB less than impressive
So my standard procedure was applied
Wash the condenser
Vacuum the tree detritus out of the cowl, drive it to dry out the condenser to avoid skewed pressure readings
Replace the cabin air filter
Remove leaves that fell into blower motor making a racket
I took a blow gun to the cage, and an unholy cloud of black dust came out, I think that's what's left of the motor brushes

It still works and it's quiet
Take a before measurement
It was noticably colder on the passenger side (where the evaporator is), drivers side was downright warm
My experience (and the Internet) tells me this is a sign of low charge
This car is very primitive in it's HVAC controls, so I don't suspect a blend door issue
Gauge up with PPE

I then purged and inverted a can of 134a I had laying around, it felt about 1/3 full
Now I'm not sure if this is a clutch on off or variable displacement compressor, so I just added very small spurts of refrigerant
Brought it to 1500 RPM, observed vent temperature
Eventually, the compressor started coming on more, and cycling more, the vent temps came down
Now it's equally cold driver/passenger side, and I used what little was left in the can
It was only mid 70s and not humid today, so it may need a little more, but I'll evaluate it over the (upcoming hotter week) and top off some more if needed
Now you turn the A/C on, it comes straight down to 40° before I'm to the corner of my block, so I suspect it was only a little low
Obviously a professional evac/recharge would be best, but that's $150+ I'd prefer not to spend
A light afternoons work and $10 in materials is keeping me comfortable, how cost effective

Pressures before
Pressures after