I ve never done one but I figgered i ll offer you what my book say on the supject hope it will help
THERMAL EXPANSION VALVE
CAUTION:Cap or tape open A/C hoses and A/C refrigerant components immediately to prevent A/C system contamination. Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for internal circulation through the R-134a A/C system and only 525 viscosity mineral oil on fitting threads and "O" rings. If lubricants other than those specified are used, compressor failure and/or fitting seizure may result.
CAUTION:When removing the TXV, keep dirt and foreign material form getting on or in the "O" ring sealing surfaces. Clean tools and a clean work area are important for proper service. The TXV seal area should be cleaned before any repairs are performed. The parts must be kept clean at all times and any parts to be assembled should be cleaned with a non-petroleum based solvent and dried with air. Use only lint free cloths to wipe parts. Do not allow solvent to enter evaporator or hose.
NOTE:Tools Required: ACR 2000 Air Conditioning Service Center (J-43600) and TXV Installation Tool (J-44655).
Disconnect negative battery cable. Recover refrigerant. See RECOVERY, EVACUATION & RECHARGING in GENERAL SERVICING PROCEDURES article in GENERAL SERVICING. Measure amount of oil removed during recovery process.
NOTE:Earlier vehicles used a bolt instead of a stud and nut.
Remove suction/liquid line assembly to Thermal Expansion Valve (TXV) retaining nut. Remove suction/liquid line assembly block from TXV by gently rocking while pulling forward.
Remove TXV-to-evaporator core bolts.
On earlier vehicles, install suction/liquid line assembly-to-TXV bolt hand tight into TXV. Using bolt or stud as a handle, remove TXV from evaporator core by gently rocking TXV while pulling forward.
Using your fingers or a plastic tool, remove "O" rings from evaporator core pipes.
Use a mirror to view "O" rings on evaporator core.
Lubricate and install NEW "O" rings on evaporator core pipes.
Install TXV using TXV Installation Tool to support evaporator core pipes and mounting flange while installing TXV.
Orient TXV with dome-shaped end toward passenger side of vehicle.
Install cap screws through T-handle and through TXV.
Thread cap screws into evaporative core flange.
Pull T-handle back against cap screws and carefully install and seat TXV into position.
Carefully remove cap screws and T-handle.
Apply a thin coating of clean mineral oil on TXV to evaporator "O" ring surfaces. Make sure TXV is completely installed. When properly installed, TXV should be almost flush with the beveled edge of the TXV foam seal.
Thread TXV-to-evaporator core block bolts into the block by hand. Bolts should thread in easily. Do not use force. If bolts do not thread in easily, verify that TXV is properly installed onto both pipes and fully seated to block.
NOTE:Earlier vehicles used a bolt instead of a stud/nut.
Remove cap or tape from suction/liquid line assembly block. Thoroughly clean "O" ring surfaces. Lubricate and install NEW "O" rings on suction/liquid line assembly block. Install suction/liquid line assembly block to TXV.
Install suction/liquid line assembly to TXV nut and tighten to specification
Tuesday, October 20th, 2009 AT 9:51 PM