I also have an A/C issue starting with warm air about six weeks ago. After verifying that my 05 GX has the current relay, I visited an Atlanta Lexus dealer who recharged the A/C with refrigerant and dye. $200 later, ice cold air - until last week.
While this seems to confirm I have a leak (or leaks), is there anything I can try on my own before going back to the dealer? Something short term could work until cooler weather arrives.
Any guidance would be greatly appreciated!