On the front unit, the orifice is located in the inlet tube of the evaporator core. Find the line that runs from the condensor to the evap core. Undo that connection, and the orifice is inside the evap core tube right there.On the rear unit. there could be either an expansion valve or an orifice. I am looking at the Ford service manual, and it doesn't say. But either one will be accessed the same way. Remove the left quarter trim, and look at the lines going into the evap core. If there is an expansion valve, you will see it right away on the inlet tube(small diameter tube). If there is an orifice, it will be located inside the inlet tube of the evap core, just like the front unit.
to change the sensor you can get to it from the bottom at the rear of the engine.there is a heat shield at the collector pipe that you will need to remove for access. it's impossible to get a good view so get a small mirror and flashlight. it is right behind the exhaust collector and it only has one 10mm bolt. you need to be somewhat of a contortionist to get it but with a little patience you can get it out without removing the exhaust pipe like it is recommended.
A better alternative to the above procedure is to go in from the passenger side in the wheel well. Because anytime you have to play with exhaust bolts more than likely after all this time these bolts are either rusted or welded in place and you end up braking them. Procedure works better if there is a vehicle hoist, but a jack and jack stands work too. Procedure is as follows:
1) loosen right front (passenger side) wheel
2) Raise front of vehicle as high as you can and place jack stands under sub frame of vehicle.
3) Remove tire and wheel asseembly.
4) Place jack under engine assembly on right side of vehicle
5) Start removing motor mount.
a) Remove 8mm bolt holding fluid lines in place.
b) Remove 18mm nut on bottom of engine mount and sub frame .
c) Remove two motor mount bolts
6) jack engine up about 1/2 inch to an inch to be able to lift engine mount out of place.
7) Remove engine mount bracket from engine
a) remove three 13mm bolts from bottom side of bracket to engine
b) remove one 13mm bolt from engine bracket side
c) remove one 13mm bolt from top of engine bracket and remove bracket.
***Now you have a clear shot at the VSS ****
8) Remove insulation piece of foam from cable area.
9) Carefully disconnect the VSS from the cable.
****Next step optional makes everything easier but adds an extra step****
10) Remove the two 8mm bolts holding the speedometer cap in place.
11) Remove the speedometer cap and VSS together.
12) Unbolt 8mm bolt holding VSS to speedometer cap and remove VSS.
13) Remove speedometer gear from VSS by removing U clip and place on new VSS.
14) Bolt VSS back onto Speedometer cap.
15) Replace speedometer cap on to transmission.
16) Reverse steps 1 to 9 to finish install.
Total time for somebody who knows what their doing 1.6 hrs. For backyard mechanic allow double so 3.2 hrs to complete. This procedure is a lot easier because you can see what you are working on and have plenty of room for your hands.
This applies to 2000-2003 Durangos, I believe it's the same on a 1998 but not positive. The fuel level sending unit is part of the fuel pump module. It is the part that has an electrical connector attached to it. It can be removed by opening the locking tabs and sliding it free of the module. This repair is somewhat complicated. If you want to attempt it yourself, I highly suggest you pick up a Chiltons or Haynes Repair Manual applicable to your vehicle at your local parts store. It contains detailed explanations, diagrams, and pictures for many repairs as well as a wealth of general information. On the 99 Durango, it's also part of the fuel pump. Mine was really easy to replace. Just have as little gas in the tank as possible, disconnect the two tubes from the rear of the fuel tank (which is plastic, nice!) Then remove the two bolts that are holding the straps that run under the tank (straps are steel) while holding the tank up with a floor jack. when the straps are out of the way, slowly lower the tank. There should be enough slack in the wires leading to the pump connector (and fuel line) to slide the tank almost all the way out from under the truck. Turn the retainer counter clockwise (I think) and it comes off and the pump lifts right out. Good Luck!
There should be a knob somewhere on the dashboard which controls the panel lights. Try turning this knob clockwise. Your dash lights may be turned all the way down, and only come on when the doors have been opened.