Q: How to Replace an Air Conditioning Pressure Switch on Dodge Charger?
A: Disconnect the cable from the negative battery terminal. Unplug the electrical connector from the air conditioning pressure switch. Unscrew the pressure switch from the line, being careful not to damage the refrigerant line. Discard the O-ring seal. Lubricate a new R-134a compatible O-ring seal with the appropriate refrigerant oil and place it into position. Screw the new switch onto the refrigerant line valve until hand tight, and then tighten it securely. Reconnect the electrical connector and the battery cable.