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the AC performance should be 1st class so there's likely something amiss
1st thing to check is that the AC rad / condenser is clear of any debris and there's nothing in front of the air flow to it, next ensure that the AC pump drive belt isn't slipping and if any doubt replace it.Also check that if there's a pollen filter to the cabin air inlet that this is clean and free flowingNext you can test components simply by checking the temperatures by touching them with the system running. with the engine at operating temperature and the AC turned on it should be as follows:A hot compressor / pumpA hot high pressure refrigerant line from the compressor to the condenserA hot condenser on the inletA warm condenser on the outletA warm liquid line from the condenser to the evaporator (before the expansion valve or orifice tube)A cold evaporator outlet lineA cold low pressure refrigerant line to the compressor
If you get a different result from the above then suspect a blockage in the line or the component whose temperature is abnormal, this can be confirmed with a pressure test
Then if you're happy the temperature control is OK ( does it do hot as well as cold?) I'd take the car to an garage that can read the pressure levels of the system so the level of gas can be checked hopefully all it needs is a re-gas
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