I am headed to auto zone in a few mionutes.
it hit 80+ and no cold air out on my 99 ML320.
Hope they have a can for me.

5/14 update. Went to Walmart. For $20 got a can of recharge stuff complete with ooil in it as my Mercedes manual suggests.. and it came with the hose & a guage as to not overfill.
Directions:
Start the truck, turn on the air, click on the hose. pull the trigger.
When the arrow hits the mark on the guage...stop.
Now it blows cold.

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles