The dryer in your A/C contains dessicant, which should be replaced after any invasive servicing of the A/C. This is generally the last step after a proper service, followed by an evacuation of the system, and then a recharging with refrigerant. Dessicant is fairly inexpensive, and an adequate vacuum pump can be purchased at a parts store.
The above details a correct servicing; run from any service that suggests that this procedure is optional. Many do, as they prefer to avoid the work involved. Moisture in an A/C system is the primary reason for failure--they cannot tolerate even a little moisture very well, as it condenses in the system, and ruins the condenser.
It has what is called a receiver drier........ It does not have a cabin filter.
Filter drier is used in an A/C system to take moisture out of the system. It is installed on the liquid line.
A filter drier for a cooling only condensing unit will have an arrow pointing in one direction. This is because the refrigerant that passes through it will always flow in the same direction. A heat pump filter drier must have the ability to allow the refrigerant to flow through it in either direction and so a filter drier that is made for a heat pump will have two arrows pointing in opposite directions.
Trash it.
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The filter/receiver/drier is an integral part of your car's A/C system that has been designed primarily to trap moisture, effectively removing it from the system and preventing corrosive damage to the A/C system. This 'drying' action is chemical in nature, so it can't go on endlessly, this is why it is very important to replace the filter/receiver/drier at intervals.
low pressure input side, but it really does not matter, because you have to pour in approx. 2 oz. of a/c pag or ester oil in there. That is if your refurring to an air conditioner unit.
A liquid line drier used in heat pumps is typically a filter drier that contains desiccants to remove moisture and contaminants from the refrigerant flowing through the system. It helps protect the system components from damage and improves the efficiency of the heat pump by ensuring proper refrigerant flow.
its under the heating swicth
If you are talking the cabin air filter, these cars do not have one. If the filter/drier in the air conditioning lines, you must remove the engine air intake piping for access, properly discharge the a/c system, and remove the two lines going to the filter. There is one bolt that holds the filter to the car, remove that and the filter unit and replace. Check out dodgeintrepid.net for a ton of info on these cars.
To replace a receiver drier in a 2002 Hyundai Sante Fe, it is recommended to take it to an authorized dealer. This part is usually cheap to replace and the only time it should be replaced is when there is a mechanical compressor failure.
if you mean the filter/drier, then looking at the engine compartment, the left side near the jack