Expansion Valve: Service and Repair

REMOVAL

WARNING: AVOID BREATHING A/C REFRIGERANT AND LUBRICANT VAPOR OR MIST. EXPOSURE MAY IRRITATE EYES, NOSE AND THROAT. USE ONLY APPROVED SERVICE EQUIPMENT MEETING SAE REQUIREMENTS TO DISCHARGE R-134a SYSTEM. IF ACCIDENTAL SYSTEM DISCHARGE OCCURS, VENTILATE THE WORK AREA BEFORE RESUMING SERVICE.R-134a SERVICE EQUIPMENT OR VEHICLE A/C SYSTEM SHOULD NOT BE PRESSURE TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR/R-134a HAVE BEEN SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DANGEROUS AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE.

1. Remove the negative cable from the battery and isolate it.
2. Recover the refrigerant from the refrigerant system.
3. Remove the ground wire from the expansion valve.

Fig. 7 Insulation Removal:

4. Remove the insulation from the capillary tube.

Fig. 8 Capillary Tube:

5. Remove the capillary tube from the evaporator line.

Fig. 9 Thermostatic Expansion Valve:

6. Remove the two attaching bolts from the expansion valve.
7. Remove the thermostatic expansion valve from the vehicle.

INSTALLATION

WARNING: AVOID BREATHING A/C REFRIGERANT AND LUBRICANT VAPOR OR MIST. EXPOSURE MAY IRRITATE EYES, NOSE AND THROAT. USE ONLY APPROVED SERVICE EQUIPMENT MEETING SAE REQUIREMENTS TO DISCHARGE R-134a SYSTEM. IF ACCIDENTAL SYSTEM DISCHARGE OCCURS, VENTILATE THE WORK AREA BEFORE RESUMING SERVICE.R-134a SERVICE EQUIPMENT OR VEHICLE A/C SYSTEM SHOULD NOT BE PRESSURE TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR/R-134a HAVE BEEN SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DANGEROUS AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE.

1. Install the thermostatic expansion valve to the vehicle.
2. Tighten the two attaching bolts to the expansion valve.
3. Install the capillary tube to the evaporator line.
4. Install insulation around the capillary tube and expansion valve line.
5. Install the ground wire to the expansion valve.
6. Evacuate the refrigerant system.
7. Recharge the refrigerant system.
8. Reinstall the negative battery cable to the battery.