Volvo Repair: Volvo 2000 V70, ac unit, c cold

Question
Hi - I have a V70 with intermittent AC problems.  The AC unit blows for about 20 minutes and then only blows hot air after that.  If you continue to drive and wait an hour or so, it might start blowing cool air again.  If you stop the car and then restart it later, it works immediately.

Any ideas?

Answer
Hi Cindy,
          If I had a guess I'd bet that your refridgerant, that makes the A C cold is low.
           You will need someone who is familiar with the procedures of...recharging your A C system.

              Cost...between 50 and 100 dollars.

       Bye,

            Bilbo