I have a 2000 328i sedan with 5sp MT (276k miles). The a/c works fine after initially driving the car and continues cooling well with no issues (even with extended driving) unless I stop and park the car for running errands (I.e trip to grocery store, etc). When I start the car again after being in the store for a short time, the A/c doesn’t provide cool air (some very minor level of cooling, as turning off ac makes it even hotter). Once the car sits and completely cools, a/c works great once again. Any ideas? If refrigerant was low, I wouldn’t expect good cooling when initially driving the car even on hot days. Could it be overcharged and causing the high pressure switch to stop the compressor once refrigerant heats up from the hot engine while shut off? Radiator cooling fan is running and coolant temp gauge remains “normal”. Back in July, I added ~8 oz of R134 due to poor cooling and everything seemed fine. After AC charge, I achieved the following numbers: ambient temp = 86 F; suction pressure = 40 psi at idle & 32 psi at 1500 rpm; discharge pressure =245 psi at idle & 275 psi at 1500 rpm; vent air temp = 57 deg f. Looking for help, as the issue seems to be getting more frequent. Thanks in advance for hanging in there with the long post and any potential feedback.