Mine is probably similar, a very slow leak. I bought the Rx400h last year after summer so ac isn’t really critical, but with some of the warm days now it did show some different. I have 2 other cars, one is a 24 year old Toyota Prado which I normally just top up the r134 myself. For the Rx400h, I noticed That there is some dark stain around the low pressure ac connection to the ac condenser While replacing my Radiator, which suggested -a seal slow leak. The ac still blow cold air at high speed, not around town, just takes a while to get it to blow cold, which to be honest is not a problem. I was just curious and realising that the car Rx400h compressor is different hence put a question is this forum. But thanks for all the input, won’t be doing anything immediately I think.
when you said ac filter you mean the drier bottle? That seems to be integrated as part of the ac condenser in the Rx400h.