We're in the Tarn and similar temps up in Montagne Noir! Hope this poor guy gets sorted in the midst of tankers being driven by soldiers! Mind you, did once have a fortnight in Italy with the temps similar, (hottest for twenty years they said) in a car with no aircon, and our Pluriel (which we uses most of the time here in France) has none either. And i have a Spanish friend who hates aircon and will never use it even if she has it on her car!
It IS possible to live without air-con, it's just a bit less comfortable especially when you are used to it.
I'd be more worried about harm being done to the compressor, drive belt failure etc.