Originally Posted by NKENN

The rear has a Thermostatic Expansion Valve (TXV) to meter the flow of refrigerant into the rear evaporator. When the TXV goes bad the rear will not cool. The TXV is accessible in the jack compartment in the rear passenger side of the vehicle. The TXV is a rectangular block with four refrigerant lines attached to it. The entire system has to be evacuated and recharged in order to replace the TXV.