Compressor, evaporator core replaced, leak test done, air conditioner warms up after running for an hour?

Question

car has been worked on 4 times now and when I get the car back the A/C works great for the first couple of hours then seems to warm up.

Answer 1

Seems the AC gas filter/diffuser needs to be looked at and the gas seems to be overcharged. Excessive gas pressure gives same indications.

Answer 2

The condenser coils need cleaning.  Or, the cooling fans are not working all the time.

Answer 3

does it blow cool again if the sits a while?they have not located the prob. you still might be losing freon, fast. or you got a block if it blows cold again after sitting. could be condenser, the o*****e tube was not replaced, could be the valve stem at the low or high side connector. i would take it somewhere else at this point...4 times is too much. have someone else locate the leak/ or blockage..could even be improper installation of the parts you had changed....funny though..because after parts are changed on any auto ac unit the system is supposed to be put into vacuum for a min of 15 min. then with the vac, disconnected...you let the vehicle sit and see if it holds vac. if it doesn't...all the leaks were not found, so the car should not have been released to you, and you charged until the vehicle held vac...to prove no leaks. if the system was not put into vac...the whole ac system can be ruined...its called Black Death....good luck to you.