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The expansion valve is located on the tubes on the evaporator. For your car you will need to remove the evaporator housing to access the expansion valve.
Remove the glove box, glove box frame, disconnect ac and heater core lines from engine side of firewall. Unbolt and remove the blower motor housing, and now unbolt and remove the evaporator housing
Sorry, yes removing them make accessing the heater core and ac lines much easier at the firewall.