Expansion valves (TX valves-thermal expansion valve)are locate at the inlet tube at the top of the evaporator unit inside the car. The line from the condenser goes in one side and the evaporator coils on the other.. Not a DYI job.
SOURCE: I can't find the rear ac expansion valve on my 95 chevy suburban?
Remove two trim panels from just inside back window and just inside rear side door passenger side. They run down from the head liner. Remove seat belt bolt ( TORX HEAD ) also. Remove lower half of trim from just inside rear side door. You should see screws holding weel cover in place. The top under glass just lifts up slightly to remove entire cover. Just a few more screws and you can hinge the top cover of the duct and fan. You will now see the top half of the rear condenser and if you look down beside it you will see the expansion valve. This about as close as you will get to changing the valve though because the freon lines running to the condenser will be stuck so solidly you would have to destroy the lines on either side of the nut to seperate them. You cannot reach the valve without lifting the condenser from its tray and you cannot lift the condenser without removing the lines from it!!! Good luck!!!
Remove the filter lid (A), then pull out the dust and pollen filters (B).
Pull out the evaporator temperature sensor (C) from the evaporator fins.
Remove the screws, carefully separate the upper housing (D) from the lower housing (E), then remove the evaporator core (F).
If necessary, remove the expansion valve (G). Use a second wrench to hold the other fitting on the valve so the evaporator line won't twist. Leave the first fitting loosely connected so you can use it to hold the valve while you loosen the second fitting.
Reassemble the evaporator in the reverse order of disassembly, and note these items:
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