Check that the low speed radiator fan works as it should. The aircn system uses it to operate. Search for 'Demist Test' to find how to test it. If the fan doesn't work it'll need the low speed resistor replacing. These are vailable from forum traders, eBay and electronics outlets. Loads of threads on this including HowTos.
If the low speed fan is OK, check that the condenser mounted on the front of the main radiator has plenty of fins left. They lose the finning after a few years and the aircon needs this to operate. You have to remove the front bumper to check.
Finally, have the aircon system checked over by an aircon specialist and regassed if necessary.
TC
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