Your aircon problem may be due to evaporator loosing cooling efficiency. SC is not equipped to handle this problem,you have to look for aircon specialist. Evaporator is not easy access on Pugs!
Coolant level at Min will not cause temp. rise. However it is adviserable to topup. You should get level low waning if coolant drops too low, but I wouldn't wait for that.
From day 1 for 4 years I have been complaining about coolant level drop. SC reply all this while has been, "checked no leak" and they topup coolant. They never answered my question "if no leak,where does the coolant go". My drop in level is about 10mm in 6 months. I have always suspected water pump and suggested to SC. SC come up with same reply " checked no leak".
Under the enhancement package water pump was changed. Guess what, my coolant level is constant now, no drop. It's only 3 months since the enhancement work, so I'm keeping a close watch.
It is possible to develop hairline cracks on heat treatment process( harding process of metal parts) during manufacture. I believe Peugeot QC picked out the flaws and proceeded with the enhancement package world wide. I value this effort by Peugeot greatly. It is certainly not an effort to falsify figures or delay tactics on impending defects.
Mine coolant also went down to minimum level at every 10k service interval... car only 1.5 years and 32k mileage....complained for 3 times also same answers as yours...anyway, i thought the recall is only for the turbo electric coolant pump instead of water pump? are they the same? and in JB the recall parts take ages to arrive..i've been asking for parts availability since february...until now only manage to do 2 out of the 4 recall items..