The air con In my car never seems cold,set it to low and no difference then after a few mins it starts blowing then a few mins later stops again. If I put max air con on it blows good and cold.

Probably low on gas, it's the first thing to check..... Pete

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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

what is the little dial under the centre vents set at? If it is in the centre of red blue then the air from the facia vents will be slightly warmer, than you expect on all but max, set it to the cold/blue side and the air from the centre vents will be fully chilled.  There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

Gas is ok and the dial set on blue,just does work as should.