Q: Ac not working and car overheating

asked by on July 07, 2016

The other day we had the a.c. on and noticed that it was not blowing out cool air, shortly after the car overheated. We took it to the shop where he changed the thermostat and a fan. The a.c. still does not work. We tried the a.c. again and once again the car overheated. We have drove the car several times with out the a.c. and it does not overheat. Only when you mess with the a.c. does it overheat. If a fan and thermostat has been changed what is causing the overheating?
My car has an automatic transmission.

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