I stopped at the shop today to tell them about the issue, and they wanted to schedule a slot for me so they can check it out. He told me he would want to evacuate and reload the system to ensure it is the correct amount. I decided to wait a few days till the weather gets hot and then have him check it, since it is quite cool out today and the system is working well and blowing cold. It hasn't been as hot as the day I posted the original issue since then, and I have not experienced the problem again.

__________________
1980 300SD (daily driver), 1981 300D (Inca Red)