With my 1990 3.0 Probe (that didn't even have a fan for the condenser), the owner had the a/c topped up while getting an oil change. The air blew cold for about 2 weeks, and I noticed a very large difference in the idle temperature as you've mentioned. The 1st generation Probes without tint are just ovens. I have the cars a/c inspected locally here, at a reputable shop that warranties their work uses a thermometer to measure the temperatures before and after...and WOW the car was a freezer after. Even in traffic the temperature may have only dropped a few degrees. Was cold for the following 2 years before I had to sell the car. Anyways. If you didn't catch on, it's all on who does the best work and can stand behind it. It cost me $270CAD to have this done, but the car only had 36,000km and thet warrantied the a/c for life if you were under 40,000km lol...1990 rolls in...lol they all had a laugh. All the best with your search my friend. Maybe look into upgrading the condenser fan perhaps or using the factory service manual to inspect the fan for proper operation. I was going to install a 12" radiator fan on a thermoswitch for mine before selling it.