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no freon cant be the issue and changing that will require removing the freon and adding new
Couple things… first, Freon is a brand name of refrigerant. Calling refrigerant "freon" is vague and generic. Modern cars are charged with R134a refrigerant.

This brings me to my next point. To me, it sounds like it very well could be that it is low on refrigerant. If its low on charge, the refrigerant will boil off soon after entering the evaporator and the coil will ice over. If the coil ices over, your airflow decreases. When you run the heat, the coil thaws. So yes, "freon" could very much be your problem. Further to that, you shouldn't need to "top up" the refrigerant charge. If its low, you have a leak. In order to recharge it you have to find and fix the leak.
 
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