As of now I'm considering the 9 year poor ac performance post r134a conversion, resolved. After putting in r152a my car's ac has been superb. Idling in 105*F weather for 10 minutes and getting high 30s low 40s at the vent.......when driving the temp drops dramatically. I'm using an infrared thermometer and see temps in to the 20s when cruising at 40 mph. On the freeway at extended travel time I have seen the temp drop into the negative double digits. I would definitely recommended anyone that is not satisfied with their r12 to r134 conversion to try this.

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1990 190E 3.0L