you can probably get away with that just make sure you have an expansion valve on the evaporator. An expansion valve will keep liquid from getting back to the compressor.
It is attached to the back wall of evaporator. You have to remove the glove compartment, blower unit and evaporator to get access to the expansion valve.
That would depend on where in the system the valve is. In many instances you can pump down the unit so all of the refrigerant is in the condenser and change a valve that is on the low side of the system or indoors.
The AC condenser unit is located right in front of the radiator.
Change the indoor filter, wipe the indoor unit down, and spray off the condenser
its an expansion valve and it is located in the black box ( in the rear unit)
The most important is the compressor, but the compressor alone can not cool down the chiller so next in line is the condenser after that is some kind of liquid flow control, that can be a capillary tube or a expansion valve then the evaporator where the real cooling happen then there is the thermostat that control te temperature
depends on the tonage and make of the unit. estimated any where from 1,500 to 4,000 dollars..
The expansion valve is found inside the evaporator housing. To replace the AC system needs to be flushed legally. Then valve is only held down by a few mounting screws. Once the AC system is bled, loosen the screws and replace the unit.
follow the high side line from your compressor, it should be just after your condensor, or it could be an expansion valve system if it's been updated, the expansion valve would look like a square block.