The factory version uses an Orifice tube. Located inside a short metal line right and the evaporator inlet where the liquid line attaches. It can be a little tough to identify because it just looks like a short line adaptor with fittings on either end.
The Dealer air version should be similar other than it uses the proper expansion valve and will be quite visible.
The Four Seasons on line catalog has photos.
Unsure what you are asking about. WHAT expansion valve - in what system?
The ac system on a Ram doesn't use an expansion valve. It uses a fixed orifice system.
If it's a TXV system, it'll be located between the receiver-drier and the evaporator.
Only the rear system has an a/c expansion valve an is located at the back left side next to the last row of seats,very easy to see.
Inside the heater/ac unit close to the main unit.
You most likely have a bad expansion valve or the system may be low on freon as well...
Yutan (located in the Yutan system within the Ombakond sector in the Expansion Region).
Kallakea (located in the Kallakea system within the Authala sector in the Expansion Region).
Drgi (located in the Drgi system within the Tokamac sector in the Expansion Region).
Rhommamool (located in the Osarian system within the Merthian sector in the Expansion Region).
Adin (located in the Adin system within the Lostar sector in the Expansion Region).
Moloskia (located in the Moloskia system within the Mbandamonte sector in the Expansion Region).