IS250 (07) Air Conditioning Issue

[KrisLexus]

Hello, I have an IS250 (07 model). Been running it for about 2 years without issue, but about 2 weeks ago the orange A/C light on the centre console (Multimedia unit) started flashing for about 15-30 seconds before the A/C kicks in. More recently, in the last couple of days the front passenger side carpets have started to become damp and there is condensation within the car. I've taken it to the garage but (frustratingly) they say they've run checks and there is nothing wrong - when there obviously is. Before I take it somewhere else at additional expense, I want to get the view from the community as to what may be the cause (and resolution) of this. Many thanks, Mr Williams

[Herbie]

No idea what's wrong but I'd take it to a vehicle AC specialist (and I don't mean Halfords) rather than a standard mechanical garage.