Maybe that will help more.
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My mechanic tells me I don't really have to bother with the expansion valve, so that's good. He says that when they replace one, they cut a hole in the side of the case around it and then go through that way to make it less of a pain in the ass.
@DRAGGIN95. I bet you don’t still have the pldiagrams that go along with these instructions, do ya?Evaporator Core Replacement - Auxiliary (Suburban/Yukon XL)
REMOVAL PROCEDURE
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CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
- Disconnect the negative battery cable.
- Recover the refrigerant. See: Refrigerant\Service and Repair
- Remove the rear quarter interior trim, as necessary.
- Remove the right rear quarter trim panel.
- Remove the right rear wheelhouse.
- Disconnect the rear heater hoses from the auxiliary heater core (7), if equipped.
- Disconnect the auxiliary refrigerant hoses from the auxiliary evaporator (6).
- Disconnect the electrical connectors, as necessary.
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9.1.Remove the case clips.9.2.Remove the 11 screws.9.3.Separate the case halves.
- Complete the following steps in order to remove the heater/evaporator case cover:
INSTALLATION PROCEDURE
- Remove the pipe insulator.
- Remove the evaporator core.
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- Install the evaporator core.
- Install the pipe insulator.
- Install the heater/evaporator case cover clips.
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- Install the blower motor (2) to the case.
- Install the auxiliary case to the vehicle.
- Connect the auxiliary refrigerant hoses to the auxiliary evaporator (6).
- Connect the rear heater hoses to the auxiliary heater core (7), if equipped.
- Connect the electrical connectors, as necessary.
- Install the right rear wheelhouse.
- Install the right rear quarter trim panel.
- Install the rear quarter interior trim.
- Connect the negative battery cable.
Still doesn't answer the question of exactly where it is.