The heater core and the evaporator core use the same housing inside the car. Before ordering a new evaporator core, it's necessary to make sure the core actually leaks, using special equipment at a dealer or air conditioning repair center to do the test. We have to take off the instrument panel to get reach the cover on the heater/evaporator housing. Changing the evaporator core needs the team to switch out the accumulator/drier too. Plus, when removing the older drier, take away the bracket bolted to the firewall. Take the refrigerant hoses off the firewall before pulling the heater/evaporator housing core out. While putting the new evaporator core into place, three ounces of special oil need to be added to the accumulator/drier inlet tube. When you reconnect the lines, be sure to put in a new orifice tube beforehand. There's an optional heat/AC option in certain Navigator/Expedition models, accessible by opening the trim panel on the left rear of the car's cabin. This option includes a blower, heater core, and separate air cooling system all within that same area of the vehicle. Describing how to take out and fix this evaporator is the same as for regular ones with some easier access. Have the dealer service team or the air conditioner repair shop check your system for leaks, recharge, and get it ready to work again.
