GS450h Air con problem

[Hadrian]

Friends who visited us on Boxing day, have a problem with the air-con on their GS450h.(2012 I believe)

It's blowing out air, but the air-con isn't doing anything.  He is going to take it back to his dealer, where it had

a full service a couple of months back, but I wondered if there is anything obvious he can look at in the meantime ?

[Herbie]

What was the ambient air temperature at the time? There is a minimum value below which AC will not work but I can't remember offhand what it is.

[NemesisUK]

0°C (32°F) is mentioned in my handbook

[Hadrian]

I can't really answer that one as it's not my car, but it wasn't freezing on Boxing day.

I would have thought the aircon would have worked at any temperature, in order to clear misted  windows. ?

It seems not....Possibly a faulty thermostat ?