OK, you said 3lbs in the first post, that would definately be overcharged.

The electric fan is triggered on low speed by high side pressure in the a/c system. That's the green (or maybe red) switch on the dryer. High speed on the electric fan is triggered only be engine coolant temp reaching 105C.

This car has a small a/c compressor which is turned rather slowly by the low idle speed of the diesel. It's normal for the a/c to not be as cold at idle.

Do you have a themometer to measure vent temps? Tough to say how well it's performing without objective measure.

I checked the pressure/temp chart and 60PSI is a good target lowside. However, that's what you want it to stabilize at running the engine at 2000RPM. If you're getting that at idle, probably undercharged. May want to add some refrigerant. Using alternative refrigerants is always an inexact science.

- JimY