You need to make sure your temperature sensors are all in the right places. There is a "freeze stat" that cuts off the compressor when the evaporator temperature drops close to freezing to prevent ice and frost formation.

When your system is charged properly, you should be mid-high 30s at the center vent with the fan on low. Colder than that and you'll ice the evaporator up. This is an air conditioner, not a meat freezer, they operate on different principles and with different operating conditions.

Your friend's Honda only has pressure switches. If he's running that cold, you're probably off on charge. A lot. Hondas hold such small amounts of refrigerant that if you overcharge it by even an ounce you can expect to be buying him a new compressor sooner rather than later. They won't put up with it for long.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]