Can old Jetta change the heater tank without freon?

Jetta needs to put freon in order to change the heater tank. To replace the heater tank, the instrument panel must be completely removed. After disassembly, it is necessary to disassemble the evaporation box assembly before disassembling the warm air water tank, so it is necessary to release or recycle Freon. Freon, also known as Freon, its name comes from English Freon, and it is a registered refrigerant trademark of DuPont Company in the United States.