Problem just started, When car decelerates hot air comes out, after a short period if I come to a stop and or excelerate the cold air comes back. I took it to the shop to check the feon and it was ok. I am a college student with a very low budget please help.
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That is because the pressure in the AC system is either getting too high or too low and the pressure switch cuts it off till the pressure drops to a normal. During that time, the air gets hot and then the switch comes back closed, the compressor comes on and the process starts over. You need a manifold pressure gage set to diagnose.
It seems with what you are describing that after disassembling many items to replace the serpentine belt, the heater thermostat has been installed incorrectly.
These have a diamond shape indicator which displays the correct orientation for assembly, the heater thermostat is NOT opening when it should be, NOT closing when it should be closed. Also not priming the coolant system properly will cost ya!
Seen this A LOT OF TIMES, costly mistakes by even the best automotive technicians, they will never admitting to this of course.