1996 Nissan Sentra A/C blowing hot air and engine stalls wh

My repair guy has done the following in an attempt to remediate this issue: a/c recharge and leak test; replace receiver drier and freon. Almost exactly a year ago, he did an a/c service. This included connecting a/c gauges; checking system pressures; checking compressor belt tension; checking operation of compressor, valves, fans and visual checking for freon leaks, along with replacing freon. He also replaced the filter drier at that time.

There is still an issue with blowing hot air and the car stalling when it's stopped at a red light and in drive or stalling when I come to an abrupt stop when the a/c is working.