Most likely it needs to have the freon recharged. This is very common with R134A systems. You can do this yourself or have a shop do. Doing it yourself requires that you locate the Low pressure line, don't worry, the recharge can adapters will only fit the low pressure side, and to follow the directions on the can and watch the attached gauge. Over charging your AC is very bad and can cause very expensive damage. All the instructions you will need for using the recharge can will be printed on the can. Follow them. If you choose to do the job yourself you can get the recharge can with Hose and Gauge from Walmart, Auto Zone or just about any places you can get Oil, plugs and Oil Filters at.
The system could be low on charge of r134a. At idle you should add a can to see if this solves the problem.
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