Also check the wire that goes down to actuate the compressor....when my AC stopped working my wire was completely missing. What had happened was in the winter my auxhillary belt had snapped and unbeknown to me also ripped out this actuating wire. When i switched the aircon on in spring I got no cold air at all as the compressor wasnt engaging.
Bit of a long shot but worth a check to see the wire is in place and plugged in 
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Jobs done with help from this forum:-
Head Gasket/Belts/Water Pump.
T4 session and spare key fob reprogram (thanks BigRuss).
Shannon Tube Replaced.
Boot Leak fixed.
Bonnet Cable fix.
Additional Boot LED lights fitted.
Plenum Drains cleaned.
Air Bag warning light.
Low Fan Speed Resistor Replaced.
Drivers door central locking (thanks Unclefista).
Handbrake compensator mod (thanks Harry).
Alloy Wheel Refurb.
New Turbocharger.
190 front brakes/caliper/discs upgrade.
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