2005 Peterbilt A/C Sleeper

Does anyone know if there is an expansion valve or orifice in the sleeper of a 379 Peterbilt 2005 model? The dealer says that there is a expansion valve but I don't see one. Looking in the lines to the evaporator I don't see any orifice either. The lines connect at a block under the cab and it looks to go right into the evaporator. This truck I am working on had strips of what looked like black plastic about 2 inches long in the condenser and the orifice tube to the cab. The orifice to the cab had actually pushed back into the evaporator. (The owner had someone add freon to it when it stopped cooling and they had 7.5 LB in it). There is zero flow through the sleeper evaporator. The evaporator is in side of the dog box and is sealed in a housing. I can see the fins where the filter is "supposed" to be on the back side.

 

I will look at it again in the morning but this block looked like it was just a union type connection only about 1 inch thick and nothing inside it. Pretty sure it was just a joint for the lines to the evaporator.

 

OK Found it. Inside the dog box is a large black enclosure that houses the heater coil, the evaporator, and blower fan. I had to drain the water from the truck (the freon is already out). Remove the plywood in the bunk that is directly above the black enclosure and then unplug all harnesses. Unhook the tubing going to the heater coil and evaporator. Remove the black enclosure and take the blower fan out. Then remove all of the screws that hold the enclosure together. Inside of the enclosure at the top of the evaporator (YOU CAN NOT SEE THIS PART WITHOUT DIS-ASSEMBLY) there is the location of the expansion valve. This expansion valve was a internally equalized unit (Elite Air #1639 but others may be different).